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

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johnnyyh

Senior Member
Jul 20, 2012
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Hi, any c636 unbrick dload firmware available? I accidentally flash N39 ease on N29. Now non stop restarting. Any help appreciate. Thanks.
 

johnnyyh

Senior Member
Jul 20, 2012
80
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Get package info failed, sir.
 

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johnnyyh

Senior Member
Jul 20, 2012
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It is hard to fix. But I need the full story. What EMUI version was before, what is now, what you used etc. A NM card is needed.
Previously was in EMUI 11 with full gapps working. Only notification problem. One day I want to try to fix the notification issue and I downgraded to 10.1.0.134 and reinstall google. At that time gapps installation was not successful. The I try to downgrade lower. I accidentically put ELS-N39 10.1.0.132 OVS , 10.1.0.1 R5 preload and 10.1.0.8 cust on hisuite proxy to flash. Flashing successful but auto restarting issue occurred. Now no USB supported but I can access OTG and NM. Thanks.
 

johnnyyh

Senior Member
Jul 20, 2012
80
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My current one is like this.
 

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badmania98

Senior Member
Sep 23, 2007
2,040
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ROMANIA
Huawei P40 Pro
Previously was in EMUI 11 with full gapps working. Only notification problem. One day I want to try to fix the notification issue and I downgraded to 10.1.0.134 and reinstall google. At that time gapps installation was not successful. The I try to downgrade lower. I accidentically put ELS-N39 10.1.0.132 OVS , 10.1.0.1 R5 preload and 10.1.0.8 cust on hisuite proxy to flash. Flashing successful but auto restarting issue occurred. Now no USB supported but I can access OTG and NM. Thanks.
See your PM in 2 minutes.
 

staljin

Senior Member
Jul 6, 2012
105
20
Hei, I am as well in same situation as johnnyyh. IMEI gone, phone restarting all the time every 10 min. I was trying to install Harmony OS. Got instead EMUI 12!?
 

staljin

Senior Member
Jul 6, 2012
105
20
Model ELS-NX9
Build Number ELS-N39 12.0.0.218(C432E3)

I am in Norway. Phone restarts every 4-5 min acctually
Screenshot_20220208_180905_com.android.settings.jpg
 

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staljin

Senior Member
Jul 6, 2012
105
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udid:true
* VendorCountry:hw-eu
* C_Version:C432
* D_version:D000
* DashBoard:41.003.53.00.06
* DeviceName:ELS-N29
* packageType:full
* FirmWare:
* FirmWare_Base:ELS-LGRP4-OVS 11.0.0.230
* FirmWare_Cust:ELS-N29-CUST 11.0.0.3(C432)
* FirmWare_Preload:ELS-N29-PRELOAD 11.0.0.3(C432R4)
*
 
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  • 5
    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.
    L.E. The transfer files between Computer and phone is available on the downgraded firmware (10.1.x.x) when you use a certain USB-c to USB-c cable. In this case a UGREEN, US355, USB-C To USB-C, 3.1, Gen.2, PD, 5A, 100W, 4K, 10 Gbps cable has been used. In the same time, using the original USB cable or other ordinary USB-c to USB-C cable have not activated the file transfer.

    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