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[GUIDE] How to solve wrong downgrade+fix USB connection to computer (P40Pro+ firmware on P40 Pro / N39 on N29)

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flankermig

New member
Sep 28, 2021
4
0
You downgraded using other Cxxx firmware files? Or just the update is not available?
I checked my phone version and downgrade to EMUI 10 C792 firmware, since I want to install GMS. After downgrade to EMUI 10, no USB connected to computer& no fast charge and OTA not detectd any new firmware. Maybe need to install the correct firmware from NM card.
 

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badmania98

Senior Member
Sep 23, 2007
1,468
543
51
ROMANIA
Huawei P40 Pro
I would try to find dload firmware (10.1.0.128) and updated via NM card. I am not awared about C792 firmware and ELS-N04 phones.
It could works. If you can upgrade to this version, verify if an update is present on System\System&Updates\Software update but do not update. Install Google ( if it is allowed on this EMUI Version) and after that do the EMUi upgrade.

Your phone is original C792 firmware and ELS-N04? It wasnt a N29 with other region?
 

starbase64

Senior Member
Apr 3, 2007
4,366
1,697
Flashing with Nano Memory has worked. I have downgraded from .x176 to x.121, and now OTA to Emui11 works again.
 

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flankermig

New member
Sep 28, 2021
4
0
I would try to find dload firmware (10.1.0.128) and updated via NM card. I am not awared about C792 firmware and ELS-N04 phones.
It could works. If you can upgrade to this version, verify if an update is present on System\System&Updates\Software update but do not update. Install Google ( if it is allowed on this EMUI Version) and after that do the EMUi upgrade.

Your phone is original C792 firmware and ELS-N04? It wasnt a N29 with other region?
Yes, my original phone firmware is P40 PRO C792 Canadian version.
 

starbase64

Senior Member
Apr 3, 2007
4,366
1,697
Great. Now you can install Google , fix the push notifications ( I have the best solution, but is not free) and upgrade to the last version of EMUI to have back the fast charge and USB connection to computer.
Push is currently working without errors.
 

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Shymmy

Senior Member
Feb 22, 2014
334
68
Bucharest
Huawei P9
Huawei P10 Lite
He's talking about using "Push notification tester" app.
Edit: I changed the image, was attached just for info, not for site, as source.
 

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Wagner Seilert

New member
Feb 19, 2021
3
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My last Downgrade was an experiment with different cust, to check if usb works.

now i have no usb and stuck on FW 176 with no working OTA.

I have a similar problem on P40 Pro(C432).

I downgrade to 10.1.0.121(C432), install GMS, OTA works up to FW176 and don't get new updates. I've waited weeks and I don't get EMUI11.

I'm no USB and fast charging, only OTG works.

I tried to install other FWs but the only one that doesn't fail on OTG is the 121.

Could you tell me what is possible to do in this case?
 

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badmania98

Senior Member
Sep 23, 2007
1,468
543
51
ROMANIA
Huawei P40 Pro
I have a similar problem on P40 Pro(C432).

I downgrade to 10.1.0.121(C432), install GMS, OTA works up to FW176 and don't get new updates. I've waited weeks and I don't get EMUI11.

I'm no USB and fast charging, only OTG works.

I tried to install other FWs but the only one that doesn't fail on OTG is the 121.

Could you tell me what is possible to do in this case?
Your firmware ( from image) is perfect. I have the same version. Do you have a sim inserted in the phone? I have seen phones without sim inserted without available firmware update. After the sim was in phone + restart the phone, firmware upgrade was available.
 

Wagner Seilert

New member
Feb 19, 2021
3
0
My last Downgrade was an experiment with different cust, to check if usb works.

now i have no usb and stuck on FW 176 with no working OTA.

I have a similar problem on P40 Pro(C432).

I downgrade to 10.1.0.121(C432), install GMS, OTA works up to FW176 and don't get new updates. I've waited weeks and I don't get EMUI11.

I'm no USB and fast charging, only OTG works.

I tried to install other FWs but the only one that doesn't fail on OTG is the 121.


Could you tell me what is possible to do in this case?
Your firmware ( from image) is perfect. I have the same version. Do you have a sim inserted in the phone? I have seen phones without sim inserted without available firmware update. After the sim was in phone + restart the phone, firmware upgrade was available.

Yes, I am using two SIM.

In this version .121 appears immediately OTA to version .176 and it is possible to update.

The problem is after updating from .176 to the next version which is not available. It always informs you that the software is up to date. I waited three weeks without receiving new OTA updates.
 

badmania98

Senior Member
Sep 23, 2007
1,468
543
51
ROMANIA
Huawei P40 Pro
Yes, I am using two SIM.

In this version .121 appears immediately OTA to version .176 and it is possible to update.

The problem is after updating from .176 to the next version which is not available. It always informs you that the software is up to date. I waited three weeks without receiving new OTA updates.

If I were you, I would try again to update:
- v1. OTA.
- v2. Erecovery
-v3 My Huawei App (former Assistance), as in image:
Screenshot_20211015_173534_com.android.settings.jpgScreenshot_20211015_173607.jpgScreenshot_20211015_173628.jpgScreenshot_20211015_173645.jpgScreenshot_20211015_173655_com.huawei.phoneservice.jpg



If none works, I would buy a NM card and using dload firmware I would try to update to the last version of EMUI11 to gain USB connection. After that, with care, downgrade back to 10..1.0.121 or 131, install GMS and update OTA to last EMUi11.

Where did you get the dload firmware 121 from? (link?)
 
Last edited:

brioblu84

Member
Jan 16, 2013
39
8
Great. Now you can install Google , fix the push notifications ( I have the best solution, but is not free) and upgrade to the last version of EMUI to have back the fast charge and USB connection to computer.
what u solution and what the cost for fix push notifications?

edit: i tried to upgrade with dload but firmware version isnt compatible. I got els-n29 c432 r4 and firmware is preload r6. U could help me? I have to upgrade to made usb work than i ll use hi suite to downgrade again..... and if u method for notify work i can buy it
 
Last edited:

zsolt64555

Member
Dec 5, 2014
43
11
I have a similar problem on P40 Pro(C432).

I downgrade to 10.1.0.121(C432), install GMS, OTA works up to FW176 and don't get new updates. I've waited weeks and I don't get EMUI11.

I'm no USB and fast charging, only OTG works.

I tried to install other FWs but the only one that doesn't fail on OTG is the 121.

Could you tell me what is possible to do in this case?
change date automatically
 

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  • 1
    Tried a lot, but so far no luck.
    Downgraded to:
    Base Software Version: ELS-LGRP4 OVS 10.1.0.176
    Cust Software Version: 10.1.0.7(C432)
    Preload Software Version: ELS-N29-PRELOAD 10.1.0.2(C432R5)

    Situation:
    * Usb connection is gone
    * Phone fully operational
    * Have a nm card and a usb c reader, both working
    * Tried a lot of dload firmware "Software install failed!" Incompatibility with current version
    * Tried and followed the guide, but 180 and 202 gives "software install failed!" Incompatibility with current version
    * Software update............Software is up to date. Current version 10.1.0.176(C432E7R5P2)
    * eRecovery -> Update and recover system -> Download and recover -> Retrieving package information -> Get package info failed
    * Didn't try usb c to usb c cable. Have it tomorrow, so wil try that.
    * Factory reset more times...

    If someone can point me in the right direction that would be very much appreciated, thanks in advance .
    In your case downgrade (dload method) to 10.1.0.121 (firmware is here) using NM card, then you can make upgrades (after you install GMS) with OTA or ERecovery (wifi).
    Your phone is C432?
  • 3
    Did you downgrade P40Pro using P40 Pro+ firmware? Maybe this thread can help you.

    This is for C432 region only. Do not use this firmware on other region firmware. I can prepare the firmware for other region.


    When you downgrade P40Pro firmware using P40Pro+ firmware elements your phone will show like this:
    10.1.0.176a.jpeg
    10.1.0.176b.jpeg
    10.1.0.176 settings.jpeg



    On those phones can use OTG adapter + dload firmware.
    The steps:
    1. Download the dload firmwares (180 and 202) from this link:

    They are not the same firmware as the ones you can find on internet.

    2. Unzip 180 firmware and copy dload folder to the memory stick (NM card if OTG is not working)

    3. Write 180 firmware using memory-stick + USB-C OTG / NM Card + ProjectMenu\Software Upgrade\1.Memory card Upgrade. To access ProjectMenu, type *#*#2846579#*#* on the original dial app.

    At the end will be like this:
    11.0.0.180.jpg


    4. Use the same procedure with 202 firmware.

    At the end will be like this:

    11.0.0.202.jpeg


    5. The USB connection to computer is back now.

    6. Use HiSuite proxy to downgrade again using the N29 firmware files (https://www.firmfinder.ml/). After this step you will have N29 back.

    At the end will be like this:

    10.1.0.121.jpeg




    7. Now you can install Google, fix the push notifications ( I have the best solution, but is not free) and make update of EMUi to have USB connection to computer and fast charging back.

    LE:

    a. It is possible to skip to install 180 and write 202 directly, but nobody tried yet. Baby steps.

    b. User @bajangg said that ”3. If you choose another Emui 10 version, like Emui 10.0.1.176 and then lost OTA Update, USB Connection, and have no idea what to do, don't afraid. Last time, when i also in the same situation, USB Type C to Type C still working for me and make my device still can connect to HiSuite.” Source: https://forum.xda-developers.com/t/googlefier-install-gms-on-huawei-honor.4180485/post-85627761 I have not tested yet, but if it works you would begin with step 6.

    c. You can use a NM card if OTG+Memory card doesn't work. You will download and extract/copy dload firmware on NM card using phone internet connection.




    Special thanks to @ciorax who puts in practice and updated my slim idea.
    1
    As I can see on your images, it doesn't download the files. Server problem or you dont have enough space on the computer partion C:\.

    Or your computer partition C:\ is not NTFS formatted (it is FAT 32 only).
    1
    I think that Your HiSuite version is not good.
    Use this tutorial, file included in description.
    1
    Search for HiSuite_11.0.0.550_OVE.exe. Maybe will work. Or the one attached, better.
    1
    Search for HiSuite_11.0.0.550_OVE.exe. Maybe will work. Or the one attached, better.
    Proxy error with this version
    Code:
     [08:27:35]: Checking if HISuite is Installed...
     [08:27:36]: HiSuite Exists, Proceeding...
     [08:27:36]: Closing HISuite....
     [08:27:38]: Checking HISuite Version...
     [08:27:39]: HiSuite Version 11 Is Installed, Proceeding....
     [08:27:39]: Patching HISuite Files....
     [08:27:40]: Patch failed, Aborting process....
     [08:27:40]: Please Contact Developer If Error Continues
     [08:27:41]: https://github.com/ProfessorJTJ/HISuite-Proxy/issues