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Umecity (VW): Allwinner T8, 2GB/32GB, 7.1.2, 9" 1024x600, Shallow 2din [2017/11]

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MGeorge34

New member
Jan 22, 2019
1
0
Hello! I have a head unit with Allwinner T8 with Android 8.1 , and i have a problem that seems to have no solution so far. From time to time (means almost everyday! ), especially at "cold start", the unit just freezes without any reason, and the only way to recover it is to reset it via the RESET buton on the front panel. I have made numerous firmware upgrades supplied by the manufacturer, as well as factory resets, but the problem persist. Does anyone know what the problem could be? The unit is Asottu CYS1060
Thank you in advance!
Best regards!
George.
 

JayNornIron

Member
Feb 22, 2018
27
0
Hi can someone send me the lastest firmware for this HU?

Thanks
 

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trooph

Member
Feb 22, 2012
15
0
Hello guys. My HU just came back from China. It sat for 5 months in customs there then it was simply sent back to me;/
I updated it with most recent firmware
Processor type- UltraOcta-T8
System ver- v9.2.2_20180314.153952_TW2-FD
And now i cant get any Bluetooth devices to be found or connect to the HU, another issue is that it doesnt display AC screen when i do any changes to the temps and stuff.. I tried different MCUs (stored on the HU not flashed) for my car non of them worked. Any ideas how can i bring it back?
 

yves31

Senior Member
Aug 23, 2008
134
19
Hello guys. My HU just came back from China. It sat for 5 months in customs there then it was simply sent back to me;/
I updated it with most recent firmware
Processor type- UltraOcta-T8
System ver- v9.2.2_20180314.153952_TW2-FD
And now i cant get any Bluetooth devices to be found or connect to the HU, another issue is that it doesnt display AC screen when i do any changes to the temps and stuff.. I tried different MCUs (stored on the HU not flashed) for my car non of them worked. Any ideas how can i bring it back?

You can flash firmwares to your HU without brick the unit, but BT may not work. My Umecity unit is compatible with JP1-FD and KBT8-FD firmwares, but BT is not working with KED1-i145 firmware. I would suggest to try V9.2.2_20180703.135630_KBT8-FD.

Do not flash MCUs to your HU if they are not coming from your seller. It's very risky to brick HU.

T3/T8 HUs have firmwares with a lot of limitations and users cannot do much about. BT, for example, may or may not work with OBD dongles. I like my HU to have Accessibility options in Settings, but I found none of T3/T8 with Android 6.0/7.1.2/8.1 has it available:(. We are at the mercy of the HU developers.
 

trooph

Member
Feb 22, 2012
15
0
You can flash firmwares to your HU without brick the unit, but BT may not work. My Umecity unit is compatible with JP1-FD and KBT8-FD firmwares, but BT is not working with KED1-i145 firmware. I would suggest to try V9.2.2_20180703.135630_KBT8-FD.

Do not flash MCUs to your HU if they are not coming from your seller. It's very risky to brick HU.

T3/T8 HUs have firmwares with a lot of limitations and users cannot do much about. BT, for example, may or may not work with OBD dongles. I like my HU to have Accessibility options in Settings, but I found none of T3/T8 with Android 6.0/7.1.2/8.1 has it available:(. We are at the mercy of the HU developers.

Alright. Which ones are compatibile with Tw2-fd's? I didnt touch the MCU. I just have few preloaded MCU for different car vendors (extra car settings) it did work when it came from china but now i cant seem to find one that is compatibile with my Honda Accord 7. As i mentioned before climate control works but i dont get a popup display showing temps zones and stuff.
I'll try the one you suggested. But will i risk bricking the whole device with incompatibile firmware?
 

yves31

Senior Member
Aug 23, 2008
134
19
Alright. Which ones are compatibile with Tw2-fd's? I didnt touch the MCU. I just have few preloaded MCU for different car vendors (extra car settings) it did work when it came from china but now i cant seem to find one that is compatibile with my Honda Accord 7. As i mentioned before climate control works but i dont get a popup display showing temps zones and stuff.
I'll try the one you suggested. But will i risk bricking the whole device with incompatibile firmware?
As for BT connection you may check if the settings are correct before flashing another firmware. Go to Settings/Car Settings/Facility Settings (password 123456), and look at Config Info. You will see BC6 or BC8 checked. I am not sure which one you may have but you can try one or the other then reboot. If not configured correctly, BT name and code will show empty.
What is the risk of bricking HU by flashing different firmware:
This post showed he had tried all firmwares without brick his unit. https://forum.xda-developers.com/an...32gb-7-1-2-t3704290/post77798987#post77798987
I flashed firmware from 3 different vendors without bricking my unit, but cannot say that you won't brick yours by flashing.
 

trooph

Member
Feb 22, 2012
15
0
So yeah i did flash this V9.2.2_20180703.135630_KBT8-FD.
Bluetooth works but doesnt transmit any sound :)
Still nothing changed in Airconditioning popup screen. Crap

Edit:
Bt works perfectly after few changes. It works on all 4 speakers not like in previous versions where it only transmited in front speakers.
AC control popup still doesnt show;/
 
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SuperYeti420

Member
Nov 21, 2011
16
0
Changing the smallest width setting from 600dp to 400dp makes the Google Assistant think this is a phone and voice dialing can be achieved. Well partly, the assistant can find the contact and process the instruction but it doesn't parse the information onto the Bluetooth app (even if you select BT app for the dialer). Meanwhile EXDialer will let you parse the information along but it doesn't find any Google contacts, but if you key in a number it does parse that information along to the native BT app.

Also you can set the dp setting back and Google Assistant will continue to work till a reboot, you can't really change it permanently since it messes with the layout of built in apps, i.e. radio, etc.

Were you able to get this working consistently? I got it working once, then the head unit rebooted and haven't been able to get it working since. I'd like to look at automating the dp change with tasker on boot but need to figure out a set of consistently working steps to reproduce and automate.
 

demonike84

Member
Sep 8, 2007
13
1
I am not sure if I am posting in the right place, my head unit is for a ford fusion but it is also a T8, it is version V9.3.1_20180731.101256_ACX24-CarPlay-I140, does anyone know how I would go about gaining root. This is android 8.1 so none of the rooting programs are working for me. I have done quite a bit of searching but cannot find out how to properly inject root into this rom. Any help is greatly appreciated.

https://wetransfer.com/downloads/98...6e3b7101c29deef73325ed9f20190221053602/3e4661
 

blaze73

Senior Member
Mar 14, 2014
78
6
Hello guys,
I just got a 9" IPS HU , T8 Octa 2GB/32GB , Android 8.1 Installed it today with a friend who has the same modell from "Isottu".
We could not get the steering wheel buttons "added" or "programmed". None of the buttons work or are recognized. He recalls he had also trouble
programming the steering wheel buttons to the HU. Do you guys know the exact method how to set up the steering wheel buttons?
Everything else works: GPS, BT, RADIO, USB etc... Also the unit is supposed to support 32GB SD card but the "slot" on the top of the HU looks very strange, it feels like
I would be dropping my 4GB SD card into a "hole". Does not look like a real slot to me :(
Please help, I really need my steering wheel buttons to work, the unit supports it - also for my friend....
Thanks! :)
 

demonike84

Member
Sep 8, 2007
13
1
Hello guys,
I just got a 9" IPS HU , T8 Octa 2GB/32GB , Android 8.1 Installed it today with a friend who has the same modell from "Isottu".
We could not get the steering wheel buttons "added" or "programmed". None of the buttons work or are recognized. He recalls he had also trouble
programming the steering wheel buttons to the HU. Do you guys know the exact method how to set up the steering wheel buttons?
Everything else works: GPS, BT, RADIO, USB etc... Also the unit is supposed to support 32GB SD card but the "slot" on the top of the HU looks very strange, it feels like
I would be dropping my 4GB SD card into a "hole". Does not look like a real slot to me :(
Please help, I really need my steering wheel buttons to work, the unit supports it - also for my friend....
Thanks! :)


What car did you put it in? Is it direct fit or universal? Did you properly connect the Key 1 Key 2 cables? Did you try what's in this video? https://youtu.be/k89yhvVjz8c
 

blaze73

Senior Member
Mar 14, 2014
78
6
What car did you put it in? Is it direct fit or universal? Did you properly connect the Key 1 Key 2 cables? Did you try what's in this video? https://youtu.be/k89yhvVjz8c

Hi, its a car specific modell,for Kia Sportage
I guess the cables (Key1, Key2) are connected properly, I did not do it myself but everything works.

I could not really see what the guy is doing in the back? What is he pushing behind the HU? Its a bit confusing....

Here is my HU https://www.aliexpress.com/item/Infidnavi-IPS-Octa-core-android-8-1car-dvd-for-KIA-sportage-2010-2015-gps-navigation-car/32884592592.html?spm=a2g0s.9042311.0.0.3da24c4dmtgcbM

Version :
 

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  • 8
    You'd think I'd learn my lesson after the last ten head units I've purchased, but I saw the new Allwinner T8 headunits, and decided I wanted to give it a try. The new radio is currently on it's way from China, and I'll be updating this thread as I find out more information.

    Update: Unit passed testing and has just shipped out. Should have it early next week if it doesn't get hung up in customs.
    Update 2: Head unit arrived yesterday (11/28/2017), and I installed it today. Initial updates below.


    [SIZE="+1"]PHOTOS[/SIZE]
    Screenshot_20171130-113605.jpgYoumecity-Android-7-1-Car-DVD-Player-Radio-Gps-Stereo-for-VW-Volkswagen-SKODA-GOLF-5.jpg
    HTB1KECZfLBNTKJjy1zdq6yScpXaw.jpgView attachment 4331016
    Screenshot_20171129-162557.jpgScreenshot_20171129-162602.jpg
    Screenshot_20171129-160550_root.jpgScreenshot_20171129-160656.jpg


    [SIZE="+2"]Umecity (Youmecity) Allwinner T8[/SIZE]
    OS: Android 7.1.2 (Nougat)
    CPU: Allwinner T8, 8-core Cortex-A7 @ 1.6GHz, up to 1.8GHz
    Memory: 2GB DDR3 RAM, 32GB EMMC, 2xUSB2, 1 MicroSD
    Graphics: PowerVR SGX544MP1 GPU (OpenGL ES1.1/2.0 OpenCL1.1)
    Display: 9", 1024x600 capacitive
    Radio Tuner: 7786
    Amplifier: TDA7851
    Output Power: 4x50w
    Dimensions: 220mm x 130mm x 27mm
    Weight: 5kg

    MCU Version: 5.3.19-145-13-A46101-171118
    System Vers: V9.2.2_20171117.102842_JP1-FD
    Linux Kernel: 3.10.65
    Security Patch Level: 2017-07-05, 7.1.2 (Nougat)

    MCU Version: T5.3.19-145-10-C06101-170318
    System Vers: V9.2.2_20170915.144527_JP1


    [SIZE="+1"]Passwords[/SIZE]
    Extra Settings: 123456
    Developer and Reset: 7890


    [SIZE="+2"]Identifying Firmwares[/SIZE]
    [SIZE="+1"]General Information[/SIZE]
    Example: 9.2.2_20171117.102842_JP1-FD
    • 9.2.2 - The hardware version, and android version. For instance, 9 is T8, and 9.2.2 is Nougat.
    • 20171117 - Release date of the firmware in YYYYMMDD format.
    • 102842 - Possibly the build time for the firmware. Uncertain.
    • JP1: The manufacturer ID.
    • FD: ???
    [SIZE="+1"]....by Version[/SIZE]
    Per @bazanovv, "There are 3 different non-compatible versions of T3 hardware and software, Default one (sleep mode added later and not so good), New one (firmware is a development of R16 branch), and K2001 (usually very compact and cheaper). Allwinner T8 head units continue and develop the same firmware branch - V9.x.x on T8, V8.x.x on T3 New (V8.3.x with Android 7.1) and V7.x.x on R16. Most tips and tricks from T3 (new one) will work on T8."
    • R16 - 7.x.x
    • T3 - 8.x.x
    • T3 - 8.3.x - Android 7.1, Nougat
    • T8 - 9.1.1 - Android 6.0.1, Marshmallow
    • T8 - 9.2.2 - Android 7.1.2, Nougat
    [SIZE="+1"]...by Manufacturer[/SIZE]
    From information gleaned mostly from various threads over on 4PDA, it is advised to not install firmwares from another manufacturer, unless it has already been patched to be universal. Issues such as red messages at the bottom of the screen, or unsupported hardware can result.
    • JP1 or JP1-FD: Umecity
    • TW2-FD: TopWay
    • KED3-5: Kaier



    [SIZE="+1"]Allwinner T8 Documentation[/SIZE]
    www.allwinnertech.com/uploads/pdf/20160515151908f5.pdf

    [SIZE="+1"]4PDA Discussion Thread (Russian)[/SIZE]
    https://4pda.ru/forum/index.php?showtopic=875407

    [SIZE="+1"]My Initial Feelings:[/SIZE]
    This appears to be basically the same chassis as the Allwinner T3 units, but with a newer CPU and OS. Unfortunately, they cheaped out a little with the bezel on this one, which didn't include a MicroSD card slot like was on the previous model. This model has the same issue of accidentally clicking the capacitive bezel buttons that the T3 had.

    The wiring is a bit of a mess. Some things were obviously just cheaped out on, like boost power for the antenna to the harness should come with connectors already installed. There is a brown/yellow wire pair coming from the CANBUS box that plugs into the back of the unit, rather than connecting via the main harness plug. Just as with the T3 model, the Volkswagen ISO1 harness has an ISO2 harness spliced into it. Having the extra connector leaves the system open to RF interference, and makes the wiring a mess.

    After working with the unit for about an hour, and running the benchmarks, I started to notice some interference from the speakers. It wasn't affected by unit volume, and was present when muted. The noise sounded like either RF interference, or he noise you get when a capacitor is squealing. I did not notice the noise before the benchmarks, and need to see if this recurs on the next boot up. After extensive listening, the noise only seems to occur (for me) after the unit has been powered on for a while, and run hard. Benchmarking, initial setup and app download, etc. Once I reboot, I don't hear the noise anymore.

    For scoring so blandly in the benchmarks, this unit is very responsive. I had no issues or slowdowns running multiple apps at the same time: Maps, Play Music, and Play Store downloading in the background, etc.


    [SIZE="+1"]Some Items Worth Pointing Out[/SIZE]:
    • Bluetooth is for phone use only: I've always been critical of Bluetooth audio quality, especially for music. It's interesting that they point out that Bluetooth only works with one sound channel, so music will not sound good. They suggest music over USB. I'm guessing with android auto, or their EasyConnect mirroring.

    [SIZE="+1"]Tests and Results[/SIZE]
    • Ease of install: Super easy to install, due to the extremely shallow depth of the device. Plenty of room for the wires behind the radio. Only annoyance was the combined ISO 1/2 adapter, which is just a mess.
    • Screen visibility: So far, so good. Less brightness, but better clarity than the Dasaita PX5 unit I have.
    • Deep Sleep: Well, no deep sleep support. Has a few shutdown times, maxing out at 30 minutes IIRC.
    • Boot time: So, the numbers quoted up top are pure fiction. Took ~40s from cold boot to launcher.
    • Backup cam start time: Excellent. Was able to use the backup camera immediately from power on.
    • Antutu Score: ~22500
    • 3DMark Score: Benchmark crashed.
    • Volume scaling: Again, default audio is too freaking loud with my OEM Fender amp. Anything past 4-5 (out of thirty) is way too loud. On the good side, seems the Amp Volume can be adjusted. When set at it's lowest level, the scaling seems to be spot on for my Fender system. Nice!
    • Rootable?: CPU-Z seems to indicate that it is already rooted, however SuperSU states that the su binary is occupied. Need to explore further.
    • Play Store apps: So far, so good. Only missing items in the store were things like Google Dialer, which would have been nice to have.
    • Android Auto: Not available in Play Store. Likely need to fake 720p screen.
    • Google Maps: Works great. No problems in my short test drive.
    • Waze: Works great. No problems that I saw.
    • Voice Search: Not installed by default. Install "Google" from Play Store. Unfortunately, internal Mic couldn't hear my voice in testing.
    • Bluetooth Call w/int mic: No tested yet.
    • Radio Signal: Strong signal, and easily locked to even faint stations.
    • Radio Audio Quality: Meh, it's analog OTA, so it sounds about as good as I would expect it to.
    • CPU Temp: According to Aida64, the CPU temperature idled around 50-60 Celsius, spiking to 74 during the benchmarks.
    • GPS Lock: GPS locked almost immediately.
    • What else should I test?


    [SIZE="+1"]Pros[/SIZE]:
    • Solid build, with shallow design.
    • Easy to install.
    • Google Maps works great, as does Waze.

    [SIZE="+1"]Cons[/SIZE]:
    • Very easy to accidentally click the capacitive bezel buttons. Can sometimes even detect a hover as a touch.
    • Internal Microphone only works with Bluetooth calling.
    5
    Thank you ****-jones. Much appreciated. Will try it this weekend.
    @karldink, @lr_man, @majsab, @sparrion

    Link to the modified firmware V9.2.2_20180310.092220_KBT8-FD-mod
    :eek: :eek: :eek:
    4
    Firmware with the root, red inscription removed. The work has been verified. You can bet on any T8. https://yadi.sk/d/UUxMzhZz3QXE6K

    The firmware does not have one file, b1604ca8-7757-11e7-906d-3390eed0c0c2 file missing!

    Please return the file to the archive with the firmware. Thank you.

    Here is a link to the entire firmware from the author's mod V9.2.2_20171026.152904_KED1-mod
    4
    Could you upload a new link to the firmware please? The link is dead. I am looking to update the firmware of my ga8150a as well.

    Link to the original firmware https://drive.google.com/file/d/1CPQEnTfxmCaSkdN8SfLhSNO6foA4hqyc/view
    :D sorry...
    4
    This is my 6.0 software
    First of all, I would like to say that @Rottgrub is ultimately right, and you should not try to flash MCU if not absolutely sure / have a backup image of yours and ready to brick the HU.

    Could you please double check the link and file, because on your screenshot you have Allwinner T8 with Android 6.0 - V9.1.x firmware branch, version V9.1.1_20170830.183839_KED3-5, while filename on your link says it is V8.2.3 (V8.2.3_20170927.200111_KED3-5.rar), which is Android 6.0 too, but for different CPU - it is a Allwinner T3 firmware branch.

    Connection of OBD2 (ELM327) adapters, as well as all other non-phone (headset) devices by Bluetooth on HU is a difficult and complicated process. Firmware and MCU updates both frequently required, and still it is a lottery, it may work, or may not. All non-standard Bluetooth devices will most likely not work. This happens because Bluetooth module is managed by MCU, not Android, is not native to Android, so it will newer work as good as on your phone. This was made, huh, to connect your phone to the HU as a handsfree device. Default Android BT software stack can be a server device on A2DP and HF profile, but can't be a client, like headphones. HU, in it's turn, must be like a headphones. Here be dragons.

    Known problems with OBD2 adapters are that password for adapter and set in BT settings must be the same and set, most frequently, to "1234". You should connect OBD2 in HU Bluetooth or Phone application, not in Android BT settings (may be called by shortcut, but will not work correctly). Bluetooth device name of OBD2 adapter must be exactly "OBDII", others will work OK with your phone, but not with HU. It seems that some fixup procedures in the code are linked to BT device name. And even if all of this is true, it seems that T8 firmware is still under development and do not work with any type of OBD2 adapter.

    Most probably, you will be able to upgrade your Android 6.0 firmware to the new one on Android 7.1, but this process is a bit more complicated and dangerous then regular firmware update. If something goes wrong, HU turns into a brick, software does not work as you want or expect - you have been warned, it's your own responsibility only.
    1) First of all, get a backup of your Android and MCU firmware from the seller, or, if this is not possible, get Root, install this backup tool for R16 and make a backup of all Android partitions, and MCU partition. It is untested on T8 yet, but it's better to have this backup, then nothing. This tool just do dd from known partitions and copy them to file, that's why root required. It may try to restore as well, but this is more risky.

    2) As you may notice, firmware update files are named like GUID's, three files .0 .1 .2 with main Android image, split into 3 parts, and smaller boot partition for Android. Names for Android 7 on T8 are well-known:
    b278023e-7757-11e7-bb3a-07933d230b22.0, .1, .2 - main Android image;
    b1604ca8-7757-11e7-906d-3390eed0c0c2 - boot (Linux core);
    bd07a5ee-fbb0-11e4-ae78-000c29ba27c0 - MCU partition for Android. DON'T FLASH it, if not 100% sure it is from yours or hardware compatible (same Radio, DSP, etc) HU. Delete this file instead, details later.
    203affea-6437-11e6-9d6a-6fc36e3d2c72 - one particular MCU firmware for immediate flashing into the MCU. DON'T FLASH it, if not 1000% sure it is fit your HU, maximal chances to get a brick. Delete this file instead.

    However, names for Android 6 on T8 are unknown. So HU will not "see" and will not start flashing Android 7 files until you rename them to the names that it expects to see. Easiest way to find the correct names - from your firmware you got from seller on step 1, or from any other T8 Android 6 firmware. Btw, if you know any - please share a link. You have to rename files with Android 7 firmware to the names Android 6 firmware expects, and start flashing in usual way. Hopefully, it will work.

    3) As you may see before, firmware version contains letters in the end, "KED3" in your case. This letters name the OEM manufacture name, and must match hardware ID, stored in the MCU firmware. If they will not match, red letters of warning will be written on the top of display: "UI unauthorized, please contact the supplier". It will not affect regular operations, but is very annoying. To delete this, you may zero out this ID in ro.fota.device string in /system/build.prop. Get Root, search for the string "ro.fota.device=" in the build.prop, find OEM letters like TW2-FD or KED1 or JP1 (or others), according to firmware, and then 4 digits of ID. Replace ID with 4 ASCII zeroes, so from ro.fota.device=KED1_0011 you will get ro.fota.device=KED1_0000. Remember about Linux cr/lf, don't edit build.prop with notepad, and restore access rights, or you will brick the HU.

    Alternatively, you may edit this string in the firmware files before flashing, and then sign the modified firmware. Manual here.

    4) Unlike other HU's, this firmware branch (starting from R16 / T3 new one / T8) do have a set of MCU files, different for different car models, stored in the separate Android partition (size 16 Mb). MCU flash size is 128 kb, so lots of them can fit onto this partition. Then you choose car model, HU selects proper MCU file from this partition, flashes it into the MCU, and then reboots. So you must not touch it or switch it off during car model select, or it will become a brick forever, and you should not select the model too frequently to save a MCU flash programming cycles. This mechanism was developed, because CANbus MCU code is different for different cars, and code for all cars does not fit the MCU flash size. Even more, different MCU may and do have different code for Radio module (mostly TDA7786/TDA7703/TEF662x) and audio DSP (mostly TDA7729(TDA7719)/Rohm BD37xxx), if you flash the wrong one, you loose Radio or sound and ability to regulate it).

    This partition gives you a unique chance to backup MCU set before flashing it (see p.1). It may be saved and flashed back with the root and backup tool or just dd (I haven't test it!!! su cd /dev/block/by-name dd if=private of=/usb0/private.img bs=4096). MCU firmware usually encrypted, and can't be read back from the MCU, so for other HUs there are no way to backup existing MCU firmware, unlike this one. However, if you accidently flash firmware with the MCU set file bd07a5ee-fbb0-11e4-ae78-000c29ba27c0, it will overwrite this partition. If this file does not fit your hardware, you will not get a brick - because, unlike 203affea-6437-11e6-9d6a-6fc36e3d2c72 file, only Android partition is flashed, MCU flash remains the same - but you will loose ability to select car model in the factory settings menu, because no suitable MCU is found for your hardware ID in the MCU partition.
    Hardware ID, Car model, Radio, DSP and lot of other features are encoded in the MCU name.
    T5.3.19-hwID-carID-С06101-YYMMDD there С06101 is a Radio, DSP and HU features bitmask. Some may be decoded with the old MCU+1.4+(+4core).exe decode tool from R16. It does not fit exactly, but may give a clue. MCU firmware name should be entered without the T letter in beginning, like 5.3.19-145-10-С06101-170318.
    You see, MCU issue is quite complicated, right? So, if you are not absolutely sure - don't flash the MCU!


    Based on 4pda.ru materials.

    P.S. As far as I know, there are no known way to get a root on T8 with Android 7 yet. You have to disassemble (take apart) firmware, insert there files for root, and then assemble and sign it back, or wait, until somebody do it for you. Unfortunately, there are no detailed step-by-step manual available, and I am unable to create it, because my knowledge is not enough.

    ---------- Post added at 04:16 PM ---------- Previous post was at 03:59 PM ----------

    I tried an external microphone, but It didn't work my own dynamic microphone.
    I think that this product uses a condenser microphone.

    It definitely uses the condenser microphone with phantom power. To say even more, it's internal microphone is connected electrically parallel to the external microphone socket, so connecting dynamic microphone will just shortcircuit it and make both unusable. Some people make a microphone jack with the switching contact, so then external mic inserted, internal will be switched off and don't collect car noise.

    Meanwhile you may try any PC computer microphone, they fit ok. Only one problem to consider - HU mic connector is a mono type, so if computer mic do have a stereo connector, it may fit bad and signal pin (right channel) may be connected to the ground. If right and left are connected inside the jack, both will be connected to ground and mic don't work.