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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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starbase64

Senior Member
Apr 3, 2007
4,366
1,696
How do I know which CUST is suitable for the firmware?

FW: ELS-LGRP4-OVS 10.1.0.131

Cust:
1. ELS-N29-CUST 10.1.0.7(C432)
2. ELS-N29-CUST 10.1.0.8(C432)

This FW and CUST 08 works fine, no USB connection but OTA Work.
This FW and CUST 07 works fine, but no USB and only OTA to FW 176.

Now i will buy a NanoMemory Card....
 

badmania98

Senior Member
Sep 23, 2007
1,210
471
51
ROMANIA
Huawei P40 Pro
You can try different Memory stick + OTG adapter + dload firmware to downgrade to 10.1.0.121 first. Then install Google and made the EMUI upgrade via OTA.

This is my original data, not affected by USB connection to computer:
Screenshot_20210918_090852_com.huawei.android.projectmenu.jpg
 

yangsong2000

Member
Oct 15, 2017
13
0
After having completed the step n.6, is the usb connection still working? or should I update to the last version of Emui 11 to get it work?
 

starbase64

Senior Member
Apr 3, 2007
4,366
1,696
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.
 

badmania98

Senior Member
Sep 23, 2007
1,210
471
51
ROMANIA
Huawei P40 Pro
I wrote in the OP:
”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.”
 

embexx

Member
Jan 12, 2011
7
0
I wasn't able to change from EMUI 11 to EMUI 10 directly.

These steps helped me:

1. Downgrade EMUI 11.x.x.x to the lowest version of EMUI 11 for your device (11.0.0.151 should do). Using HiSuite Proxy

2. Downgrade EMUI 11.0.0.151 to 10.1.0.176 using HiSuite without Proxy (select other version in Hisuite)

3. Downgrade from 10.1.0.176 to 10.1.0.121 using HiSuite 10.1.550 and Proxy or use OTG and SD-Card.
 

starbase64

Senior Member
Apr 3, 2007
4,366
1,696
I have tested some downgrades from 11.0.0.202 and USB is always dead for me.

Upgrade to 11.0.0.202 and USG works again.
 
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badmania98

Senior Member
Sep 23, 2007
1,210
471
51
ROMANIA
Huawei P40 Pro
I wasn't able to change from EMUI 11 to EMUI 10 directly.

These steps helped me:

1. Downgrade EMUI 11.x.x.x to the lowest version of EMUI 11 for your device (11.0.0.151 should do). Using HiSuite Proxy

2. Downgrade EMUI 11.0.0.151 to 10.1.0.176 using HiSuite without Proxy (select other version in Hisuite)

3. Downgrade from 10.1.0.176 to 10.1.0.121 using HiSuite 10.1.550 and Proxy or use OTG and SD-Card.
Downgrade from a higher or = version EMUi11.0.0.193 (C432) will results on no USB connection to the computer. It is better to have a NM card, just in case.
 

flankermig

New member
Sep 28, 2021
4
0
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:
View attachment 5409301View attachment 5409305View attachment 5409321


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:
View attachment 5409359

4. Use the same procedure with 202 firmware.

At the end will be like this:

View attachment 5409361

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:

View attachment 5409363



7. Now you can install Google 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.
I downgrade P40 PRO (C792) from EMUI 11 to EMUI 10 for install GMS, but USB data transfer (only charging) not working and no fast charging any more. Can you help to provide correct firmware ?
 

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    P40 PRO.jpg
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badmania98

Senior Member
Sep 23, 2007
1,210
471
51
ROMANIA
Huawei P40 Pro
I downgrade P40 PRO (C792) from EMUI 11 to EMUI 10 for install GMS, but USB data transfer (only charging) not working and no fast charging any more. Can you help to provide correct firmware ?
If an EMUI update is available, update to the last version of EMUI11 and everything will be OK. There is no other solution.
Losing the fast charge and connection to computer is a common issue when you downgrade from last Emui11 to EMUI 10. How do you know you downgraded a wrong firmware?
 
Last edited:

flankermig

New member
Sep 28, 2021
4
0
If an EMUI update is available, update to the last version of EMUI11 and everything will be OK. There is no other solution.
Losing the fast charge and connection to computer is a common issue when you downgrade from last Emui11 to EMUI 10. How do you know you downgraded a wrong firmware?
Hi since OTA is also not working (shows already have the latest firmware), I can't update to EMUI 11.
 

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  • 1
    Just want to say thanks to badmania98 for his help to fix play services on my phone. All of it working perfectly including push notifications and no more play protect error as well.

    I really think it's still value for money for the small amount of donation compared to us troubleshooting and try to fix the issue for few hours or days. He completed the installation and fixed it just within 30 mins and it might took me few days to figure it out(or won't ever figure it out as well :D)

    Totally would recommend anyone that need assistance with their Huawei phone and its play services installation to reach out to @badmania98
  • 1
    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