[PX3 & 5] [OTG] - No Headunit Mod, recover or flash a SOM with a simple USB cable

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Xoberr

Member
Mar 17, 2021
10
1
I have only managed to enter loader mode once in 1 year.... (I have patience, I know haha) I don't know what I'm doing wrong, in maskrom mode it enters perfectly. I have been able to flash the px3 board that I have, in maskrom mode it always gave me the error boot download fail. I am going to buy new resistors and I am going to make some new cables, the radio still does not start and I would like to fix the px5 as well.
 
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poor_lackey

Member
Oct 15, 2022
5
2
Plus how many computers were tried, were the instructions followed, what was tried, how was masrom entered................

Why would the storage be defective, doesn't make sense unless something not disclosed

Apologies for delayed response.
I provide support frequently in a completely unrelated forum and fully understand your scepticism.
Everything has been disclosed, I see no value in non disclosure when seeking support for an issue I can't resolve - it would just waste my time and yours.
1 computer tried, the usb interface is recognized correctly when the tweezer hack mentioned in post #942 is followed. Loader mode is entered and as posted I can read 'Chip Info' and 'test device' but cannot access the flash and ever option results in 'Get FlashID Fail'.
Based on a quick check of unzipped downloads I have tried AndroidTool 2.35, 2.52, rockChip Driver Assist 1.3, 4.8, 5.1.1
I assume either the V3 devices are different from V4\later versions, or I have missed the winning tool\usb driver combo.

It's no longer a priority as purchased a replacement but have an aversion to throwing away good stuff... even more than I hate it when technology beats me, so every hopeful.

And to those that have provided suggestions, thanks for your time and input.
It's greatly appreciated.
 
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Artiem

Member
Feb 20, 2014
35
2
Can somebody tell me if with this method i can repair and unbrick px5 unit after MCU updating fail? The unit totally don't work and buttons do not light up.
 

Sertacakin

Member
Jul 18, 2021
10
1
Hi
My px5 device stayed on black screen with sd card method, I made otg cable
Windows 10 recognizes drivers
I am using rockchip batch tool v1.7
sees SOM
When I say firmware upgrade, I get "check chip fail" error
I followed the forum and came here, it gave an error
please help
sorry for my english
 

marchnz

Senior Member
Nov 26, 2012
5,362
1,170
NZ
Hi
My px5 device stayed on black screen with sd card method, I made otg cable
Windows 10 recognizes drivers
I am using rockchip batch tool v1.7
sees SOM
When I say firmware upgrade, I get "check chip fail" error
I followed the forum and came here, it gave an error
please help
sorry for my english
Information is in the thread. Perhaps use a good translator and take your time to read the first post.
 

Artiem

Member
Feb 20, 2014
35
2
Can somebody tell me if with this method i can repair and unbrick px5 unit after MCU updating fail? The unit totally don't work and buttons do not light up.
 

marchnz

Senior Member
Nov 26, 2012
5,362
1,170
NZ
Can somebody tell me if with this method i can repair and unbrick px5 unit after MCU updating fail? The unit totally don't work and buttons do not light up.

the information is in forums if willing to put in a little time searching and reading. This is not the thread for it though
 

Artiem

Member
Feb 20, 2014
35
2
I did not try anything yet but i found a thread how to recover dead mcu so i must try after holidays
 

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  • 20
    "Factory" Recovery for MTCx PX3, PX5 and PX6 SOM.

    Finally - OTG for all without modifying your head-unit. With only basic electronic/soldering skills, get OTG and fearlessly flash or recover a 'bricked' MTCD/E (HCT printed on SOM) Rockchip PX3, PX5 SOM.

    See attached pics for making an OTG cable from a USB cable and two resistors.
    Resistors are 12K and 15k (22k is probably better) or anyone of the following. combinations. These resistors are necessary as 'voltage dividers', with a value between 1.8v and 3.3 OK. These simply place a logic '1' on recovery and USB-OTG to 'tell' the SOM to go into OTG recovery mode.
    R1 | R2
    -------------------
    1K | 1.8K
    2.2K | 3.3K
    10K | 18K
    12K | 22K

    Get Windows Driver [Driver assistant - latest version] and [Android tool - latest version] for direct/OTG SOM flashing here.. Be sure to edit [android tool] .ini file to set English, otherwise tool will be rendered in Chinese.

    This tool for dumping / getting full backup of SOM
    Excellent tool, thanks @RedScorpioXDA

    Note - all tools and driver have equivalent Linux versions.

    PX5 Android 9 Update.img - suitable for flashing via rockchip tools - https://yadi.sk/d/umCvHqCDzHccr/RockChip PX5 Android 9/YB
    • The image is located in px5 android 9/yb. The file has "_img_" listed in the filename.
    • Note Android 10 has an img file too - located in px5 android 10/chs.

    PX5 Android 8 Oreo full Partition extract suitable for recovering SOM, flashing via rockchip tools - https://drive.google.com/drive/folders/1P703unZDA_TdRzl6fjkkb-YUB-KpTViW


    Using the RockChip Android Tool:
    • For OREO: Unzip and flash all partitions in the ZIP file [px5_OREO_Full_13032018-UseToRecoverOrCreateNew.7zip here
    • For Android 6, flash the latest update.img file in android tool

    There are guides to partition flashing found on the internet, would be great if anyone could contribute by posting step-by-step instructions or a video to assist others (there are now posts in this thread...)

    A generic guide to the RockChip Android tool, flashing partitions or image files is here as previously posted.

    Credit (thanks!) to @scorillo_ro for the detailed image/connections diagram.

    Worst case - SOM doesn't respond - force 'maskrom' detailed here explaining what MaskRom is and here on how to for your PX5 (px3 is similar.) Steps are: Power Off SOM and disconnect USB to PC. Use Tweezers, apply power/connect USB. Hold until Windows Device chime is heard (within about 2 seconds of power on.) See attached pic.

    Warning : Use thin pins for OTG cable in order to avoid the damage of the SOM connectors, although along the thread it has been noted many times that damage to the SOM socket is very likely to happen if thick pins are used...OR buy SOM header from Aliexpress, digikey etc.[/COLOR]

    17/11/2019 - Edit: Corrected URL for Windows and Linux Rockchip tools

    04/04/2020 - link to px5 android 9 full update.img
    14
    Nice work @marchnz !
    A full step by step and pictures howto should be made now and all those PX5 users without sdcard slots will be able to use this method to get Android8!

    LE. I drew a schema
    3
    Is there a howto to install Android 8.0 via OTG?

    Thank you

    Theres an entire thread about how to install Oreo.
    3
    Many thanks :D
    I take it the board in the first thread above is the one out of any PX5 android car radio ?
    Yes, on the first page of the thread you will see PX5 boards, both the green one and the blue one.
    Both are PX5 boards, just different versions...

    ---------- Post added at 10:01 AM ---------- Previous post was at 09:49 AM ----------

    Do we need a male to male USB wire? Or does a normal USB wire work to?
    No, you can cut and use any USB cable that have at least one male plugs at its ends.
    If you don't have any spare USB cable to use and need to buy one, you can buy an male to male one just to cut it in two equal parts. Use one part to build the PX5 OTG cable and keep the other one for spare :)

    I'll also recommend the cable to be not too long and not too thin.
    2
    Finally I succeeded! I rewrote the sdupdate on the som in maskrom mode, and finally my PX5 is back to work with oreo 8 of Malaysk. Thank you so much marchnz.

    Cant upload the Firmware from MaskRom Mode. I got the "usb device not recognized" error. I never goth my the device in the loader mode. My PC never detected the SoM in loader mode.

    Also I have had several problems to recognize the SOM from the PC, in addition to what you have already suggested marchnz I add only to bring to gnd also the shielding of the usb cable and two cables gnd to the som.

    I add photos that perhaps clarifies what I suggest