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

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badmania98

Senior Member
Sep 23, 2007
2,040
678
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ROMANIA
Huawei P40 Pro
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)
*
Hm. I dont know if it works (0.1%) but you can try this:
a. download 11.0.0.230 from here.
-extract dload folder

b. download 11.0.0.202 from here.
-extract dload folder

c. create another dload folder on the computer
- copy on it the update_sd_base.zip from 230
- copy on it the folder ELS-N29_hw_eu from 202

d. copy this dload folder (from point c) to the NM card

e. Restart the phone on eRecovery and try to write the firmware from memory card.

If it is working, let me know. It is not done.
 

zemla387

Member
Feb 7, 2022
6
2
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, 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.
Hello,

I have a usb problem. After the downgrade, I can't connect to hisuite via usb. Only when I update 11.202 emui, the error is fixed. I tried both versions for p40 pro.

ELS-LGRP4-OVS 10.1.0.121 + 10.1.0.8(C432) + / ELS-N29-PRELOAD 10.1.0.1(C432R4)
ELS-LGRP4-OVS 10.1.0.131 + 10.1.0.7(C432) + / ELS-N29-PRELOAD 10.1.0.1(C432R4)

How to fix usb problem without emui update? (for 11...202)
 

badmania98

Senior Member
Sep 23, 2007
2,040
678
52
ROMANIA
Huawei P40 Pro
Hello,

I have a usb problem. After the downgrade, I can't connect to hisuite via usb. Only when I update 11.202 emui, the error is fixed. I tried both versions for p40 pro.

ELS-LGRP4-OVS 10.1.0.121 + 10.1.0.8(C432) + / ELS-N29-PRELOAD 10.1.0.1(C432R4)
ELS-LGRP4-OVS 10.1.0.131 + 10.1.0.7(C432) + / ELS-N29-PRELOAD 10.1.0.1(C432R4)

How to fix usb problem without emui update? (for 11...202)

To have the big picture you can read no 7 here.

Just to use USB connection you can try to use:

a. HarmonyTP cable

or

b. UGREEN, US355, USB-C To USB-C, 3.1, Gen.2, PD, 5A, 100W, 4K, 10 Gbps cable

”Our new mate ......... provided us 2 images which prove that transfer files between Computer and phone is available on the downgraded firmware (10.1.x.x) when you use a certainn 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 ordinar USB-c to USB-C cable have not activated the file transfer.”
 

zemla387

Member
Feb 7, 2022
6
2
To have the big picture you can read no 7 here.

Just to use USB connection you can try to use:

a. HarmonyTP cable

or

b. UGREEN, US355, USB-C To USB-C, 3.1, Gen.2, PD, 5A, 100W, 4K, 10 Gbps cable

”Our new mate ......... provided us 2 images which prove that transfer files between Computer and phone is available on the downgraded firmware (10.1.x.x) when you use a certainn 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 ordinar USB-c to USB-C cable have not activated the file transfer.”
Thank you for your answer.
Why do you think usb and fast charge don't work when you downgrade like this? Did you have this problem, or did I not make it?
121 or 131 downgrade As far as I can tell, usb and Fast charge won't work without 100w cable or emui update?
 

wenji

New member
Feb 9, 2022
1
0
Sir I download 180 and 202 firmware to my device I have done wrong downgrade lately but this is the result after i apply the zip 180 to my device
 
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staljin

Senior Member
Jul 6, 2012
105
20
Hm. I dont know if it works (0.1%) but you can try this:
a. download 11.0.0.230 from here.
-extract dload folder

b. download 11.0.0.202 from here.
-extract dload folder

c. create another dload folder on the computer
- copy on it the update_sd_base.zip from 230
- copy on it the folder ELS-N29_hw_eu from 202

d. copy this dload folder (from point c) to the NM card

e. Restart the phone on eRecovery and try to write the firmware from memory card.

If it is working, let me know. It is not done.
IT did not work
 
Last edited:

NinkaKitou

New member
Feb 17, 2022
2
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, 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.
Hello @badmania98,

Thanks a lot for sharing this and for all your efforts on the subject.
I would like to try this procedure, but I cannot download the firmwares 180 and 202.
The link is asking for a password... Did I miss something ?

I am very new here, sorry if my question is silly.

Thanks again
 

badmania98

Senior Member
Sep 23, 2007
2,040
678
52
ROMANIA
Huawei P40 Pro
Hello @badmania98,

Thanks a lot for sharing this and for all your efforts on the subject.
I would like to try this procedure, but I cannot download the firmwares 180 and 202.
The link is asking for a password... Did I miss something ?

I am very new here, sorry if my question is silly.

Thanks again
You are right. I will provide the password for a short period of time if you convince me that you are in the situation and have the same error on the same phone as described. Many guys didn't understand the thread and wrote those firmwares on different phones or regions.
 
Last edited:

NinkaKitou

New member
Feb 17, 2022
2
0
You are right. I will provide the password for a short period of time if you convince me that you are in the situation and have the same error on the same phone as described. Many guys didn't understand the thread and wrote those firmwares on different phones or regions.
Hi,

So, I have a P40 Pro device, ELS-N29, C432 region, R5.
To start with, I had the firmware version 11.0.0.260 and I had trouble downgrading it.
I found this very useful downgrade workaround using an otg adapter:
https://github.com/ProfessorJTJ/HISuite-Proxy/issues/148#issuecomment-1000913711

I was able to downgrade to 11.0.0.230, and after using HiProxy, I downgraded to 10.1.0.114.
Here is my current versions info:
- Preload software version: ELS-N29-PRELOAD 10.1.0.1(C432R6)
- Cust Software version: ELS-N29-CUST 10.1.0.7(C432)
- Base software version: ELS-LGRP4-OVS 10.1.0.114

Everything works great, except that USB is not working anymore. I tried to use HiSuite, but no chance...
I cannot transfer file, or use ADB AppManager.

I hope this clarify my situation, and that I am on the right thread for my problem.

Again thanks a lot for all,
 

badmania98

Senior Member
Sep 23, 2007
2,040
678
52
ROMANIA
Huawei P40 Pro
Hi,

So, I have a P40 Pro device, ELS-N29, C432 region, R5.
To start with, I had the firmware version 11.0.0.260 and I had trouble downgrading it.
I found this very useful downgrade workaround using an otg adapter:
https://github.com/ProfessorJTJ/HISuite-Proxy/issues/148#issuecomment-1000913711

I was able to downgrade to 11.0.0.230, and after using HiProxy, I downgraded to 10.1.0.114.
Here is my current versions info:
- Preload software version: ELS-N29-PRELOAD 10.1.0.1(C432R6)
- Cust Software version: ELS-N29-CUST 10.1.0.7(C432)
- Base software version: ELS-LGRP4-OVS 10.1.0.114

Everything works great, except that USB is not working anymore. I tried to use HiSuite, but no chance...
I cannot transfer file, or use ADB AppManager.

I hope this clarify my situation, and that I am on the right thread for my problem.

Again thanks a lot for all,
Yes. It is clear. You have nothing to do with this thread and those firmware.

You have to use wifi connection and download&install GMS on your 10.1.0.114 (you gone to low. It was better on 10.1.0.121). After that upgrade to 11.0.0.202 using one of that, and your USB will be fine:
a. HiSuite-original (no proxy)
b. MyHuawei App
c. OTA ( phone menu)
d. eRecovery (wifi)

You can find more on my thread here.

Reading first will help you.
 
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1morgoth1

New member
Feb 22, 2022
1
0
I had the same trouble as all of you. USB got disabled, OTA, OTG, eRecovery everything straight to hell. I got a ELS-N29-C432R5 and i am now trying to get nanosd card working. Can somone confirm what i do is correct. Right now i have base 10.1.0.176 as a base version. somthing that people say causes alot of trouble. so now i am trying do downgrade to 10.1.0.121 with these files:

ELS-LGRP4-OVS 10.1.0.121

ELS-N29-CUST 10.1.0.7(C432)

ELS-N29-PRELOAD 10.1.0.2(C432R5)

They are all going in the same dload folder. Do i need to specify names for them or can they be named standard names as "update_full_base.zip".

What happens on the 176 build is that recovery does not allow restores from backup. even though i changed the dates and removed the backup program and changed it with another
 

badmania98

Senior Member
Sep 23, 2007
2,040
678
52
ROMANIA
Huawei P40 Pro
I had the same trouble as all of you. USB got disabled, OTA, OTG, eRecovery everything straight to hell. I got a ELS-N29-C432R5 and i am now trying to get nanosd card working. Can somone confirm what i do is correct. Right now i have base 10.1.0.176 as a base version. somthing that people say causes alot of trouble. so now i am trying do downgrade to 10.1.0.121 with these files:

ELS-LGRP4-OVS 10.1.0.121

ELS-N29-CUST 10.1.0.7(C432)

ELS-N29-PRELOAD 10.1.0.2(C432R5)

They are all going in the same dload folder. Do i need to specify names for them or can they be named standard names as "update_full_base.zip".

What happens on the 176 build is that recovery does not allow restores from backup. even though i changed the dates and removed the backup program and changed it with another
How is your issue related to this thread?

Maybe is better to read this thread.
 

night_dreamer

New member
Jan 29, 2011
1
0
Hello good night,

I´ve used the downgrade process for my C432 R5 P4 Pro from

EMUI 11 to 10.1.0.121 following your guide switching to Rx...installed GService...and had an OTA upgrade to 10.1.0.176, after that USB, hisuite, OTA stoped working.

Trying to use the detailed work arround but need acess to the firmware files, could you please send me the password files in order to proceed?

Best regards

EDIT: just received my NM card, its the only way to go on this P40.
 

manusiatimur

Member
Mar 2, 2022
13
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, 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.
thanks
!!!
 

Scampt

New member
Mar 5, 2022
3
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, 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.
Whats the password of the firmware files?
 
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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