Develop Bugs

[Q] How to Revert to stock from MIUI

I flashed miui, but i now would like to return to stock, all the firmwares i downloaded with a flash_all.bat or anything of the sort is not in english and im afraid i would brick my phone. Is there a fllashable zip through the stock recovery to return to official firmware? Or if anyone could post a firmware installer with instructions in english. Thank you very much

UhmierSmith said:
I flashed miui, but i now would like to return to stock, all the firmwares i downloaded with a flash_all.bat or anything of the sort is not in english and im afraid i would brick my phone. Is there a fllashable zip through the stock recovery to return to official firmware? Or if anyone could post a firmware installer with instructions in english. Thank you very much
Click to expand...
Click to collapse
Download Any Official Firmware Or Custom ROM Like HYD52ROM Or Clean ROM They Both Are Almost Stock firmware With Tweaks And Removed Chinese Craps.

husen4u said:
Download Any Official Firmware Or Custom ROM Like HYD52ROM Or Clean ROM They Both Are Almost Stock firmware With Tweaks And Removed Chinese Craps.
Click to expand...
Click to collapse
Thanks but for those roms you need to be on b11cn, which i cant get to cause im stuck on miui, help? before miui i was on b111

UhmierSmith said:
Thanks but for those roms you need to be on b11cn, which i cant get to cause im stuck on miui, help? before miui i was on b111
Click to expand...
Click to collapse
Ok Then Download Official Firmware B125 And Install Via dload/update.app Method.

husen4u said:
Ok Then Download Official Firmware B125 And Install Via dload/update.app Method.
Click to expand...
Click to collapse
I have downloaded the firmware and extracted. I cant open the update.app Do i transfer this to my phone or something? sorry for my inexperience

UhmierSmith said:
I have downloaded the firmware and extracted. I cant open the update.app Do i transfer this to my phone or something? sorry for my inexperience
Click to expand...
Click to collapse
make a folder name dload in your root of external sdcard. copy update.app in externalsdcard/dload folder. poweroff the phone. press vol+vol-power together untill setup starts. (release power after huawei logo continue pressing vol+ - Untill Setup starts)

How to revert to stock recovery after install TWRP 2.6.3.5

Hello
when buying P6 original rom was b111 international
then I install KK beta
then TWRP 2.6.3.5
then several custom rom by LightningKat and HYD52ROM a currently LightningKat RC02.
Question:
How install back rom b111?
Which stock twrp recovery we can apply on TWRP 2.6.3.5 for instal JB rom with dload method? eg. b111 international
Thank you for response

mstaskovan said:
Hello
when buying P6 original rom was b111 international
then I install KK beta
then TWRP 2.6.3.5
then several custom rom by LightningKat and HYD52ROM a currently LightningKat RC02.
Question:
How install back rom b111?
Which stock twrp recovery we can apply on TWRP 2.6.3.5 for instal JB rom with dload method? eg. b111 international
Thank you for response
Click to expand...
Click to collapse
in first page u have answer.
http://forum.xda-developers.com/showthread.php?t=2534420

richish said:
in first page u have answer.
http://forum.xda-developers.com/showthread.php?t=2534420
Click to expand...
Click to collapse
Hello
this thread I read but I do not know whether it is possible install twrp stock recovery 2.6.3.0 on twrp 2.6.3.5 from this thread http://forum.xda-developers.com/showthread.php?t=2632542

mstaskovan said:
Hello
this thread I read but I do not know whether it is possible install twrp stock recovery 2.6.3.0 on twrp 2.6.3.5 from this thread http://forum.xda-developers.com/showthread.php?t=2632542
Click to expand...
Click to collapse
oh i thinked that u are looking for stock P6 recovery !
yes u are able to flash TWRP 2.6.3.0 over TWRP 2.6.3.5

richish said:
oh i thinked that u are looking for stock P6 recovery !
yes u are able to flash TWRP 2.6.3.0 over TWRP 2.6.3.5
Click to expand...
Click to collapse
sorry i am layman and my english is very bad
I am installed twrp 2.6.3.5 and I am looking STOCK P6 recovery

richish said:
in first page u have answer.
http://forum.xda-developers.com/showthread.php?t=2534420
Click to expand...
Click to collapse
I actually have the same question. Cannot B118 recovery brick your phone?

Can you any one help me?
On my P6 i have instaled TWRP 2.3.6.5 and custom rom from this thread http://forum.xda-developers.com/showthread.php?t=2631444 in version 2.1
1. I want install stock twrp from this thread http://forum.xda-developers.com/showpost.php?p=49978337&postcount=249 it is a right source? it is possible install this stock twrp on version 2.3.6.5
2. Then i want install KK beta how can i do it? it is posible via dload method (local update) or how?
3. Then i want install back B125 international rom how can i do it? it is posible via dload method when KK beta will be installed. or how
Thanks

Looks like your goal is to go back to B125?
Just flash recovery only from the link you posted:
http://www.androidfilehost.com/?fid=23329332407568599
You don't need to flash KK beta, flash B125 immediately.
Place UPDATE.APP from B125 in dload folder on your external SD card. Turn off the phone.
Turn it back on while holding volume down+volume up+power. Hold for at least 3 seconds. Update should start by itself.
Hope it works for you.
mstaskovan said:
Can you any one help me?
On my P6 i have instaled TWRP 2.3.6.5 and custom rom from this thread http://forum.xda-developers.com/showthread.php?t=2631444 in version 2.1
1. I want install stock twrp from this thread http://forum.xda-developers.com/showpost.php?p=49978337&postcount=249 it is a right source? it is possible install this stock twrp on version 2.3.6.5
2. Then i want install KK beta how can i do it? it is posible via dload method (local update) or how?
3. Then i want install back B125 international rom how can i do it? it is posible via dload method when KK beta will be installed. or how
Thanks
Click to expand...
Click to collapse

thanks
iwtfmcl said:
Looks like your goal is to go back to B125?
Just flash recovery only from the link you posted:
http://www.androidfilehost.com/?fid=23329332407568599
You don't need to flash KK beta, flash B125 immediately.
Place UPDATE.APP from B125 in dload folder on your external SD card. Turn off the phone.
Turn it back on while holding volume down+volume up+power. Hold for at least 3 seconds. Update should start by itself.
Hope it works for you.
Click to expand...
Click to collapse
Thanks
Now I need a phone
Try and write whether it succeeded

Thank you very much
it is work.
Can you say me if i want install again twrp 2.6.3.7 it is necessary install first KK beta for unlock bootloader or bootloader is still unlocked and i can install twrp 2.6.3.7 directly on b125?
If is it still unlocked, it is also possible install twrp 2.6.3.3 for testing any JB custom rom?
Thanks
iwtfmcl said:
Looks like your goal is to go back to B125?
Just flash recovery only from the link you posted:
http://www.androidfilehost.com/?fid=23329332407568599
You don't need to flash KK beta, flash B125 immediately.
Place UPDATE.APP from B125 in dload folder on your external SD card. Turn off the phone.
Turn it back on while holding volume down+volume up+power. Hold for at least 3 seconds. Update should start by itself.
Hope it works for you.
Click to expand...
Click to collapse

mstaskovan said:
Thank you very much
it is work.
Can you say me if i want install again twrp 2.6.3.7 it is necessary install first KK beta for unlock bootloader or bootloader is still unlocked and i can install twrp 2.6.3.7 directly on b125?
If is it still unlocked, it is also possible install twrp 2.6.3.3 for testing any JB custom rom?
Thanks
Click to expand...
Click to collapse
As I understand surdu_petru stated that you can flash TWRP 2.6.3.7 only on KK Beta, and 2.6.3.3 only on B118 unlocked firmware.
For flashing any custom ROM you have to read what ROM developer says. If developer of the custom ROM says "you can only flash it on B118", then you must be on B118. I would not try to flash it on B125 unless I was brave/dumb!

want to go back to JellyBean B125 from Kitkat beta
installed kitkatbeta > rooted > installed twrp > installed gapps > now device is too laggy & slow..
want to go back to stock jellybean B125 firmware

huzaif_a said:
installed kitkatbeta > rooted > installed twrp > installed gapps > now device is too laggy & slow..
want to go back to stock jellybean B125 firmware
Click to expand...
Click to collapse
I'd advice you to flash HYD52ROM KK. Great performance
Sent from my P6-U06 using XDA Premium 4 mobile app

huzaif_a said:
installed kitkatbeta > rooted > installed twrp > installed gapps > now device is too laggy & slow..
want to go back to stock jellybean B125 firmware
Click to expand...
Click to collapse
First, please install stock recovery KitKat, than you are able to flash any firmware you want by : external sdcard/dload/UPDATE.APP method !
Good luck !

unable to go stock recovery
kindly give some elaborated tutorial link as how to go back to stock recover & stock rom

Downgrade from B506 to B125 failed

I updated to B506 but I dont have Gapps anymore. So I want to downgrade to B125 or B132 but both failed at checking verlist. What can I do.
I am also not able to boot in Fastboot mode with adb and Power + Volume Down. :crying:

You could also flash GApps through TWRP...
Sent from my P6-U06 using Tapatalk

lootjelo said:
You could also flash GApps through TWRP...
Sent from my P6-U06 using Tapatalk
Click to expand...
Click to collapse
(I said that I cant go in Fastboot mode to flash TWRP again.)
OK I am now able to boot in bootloader after much testing I will try it.

I also had the vetlist problem downgrading from b014 to b125. But bootloader still worked. The only thing that worked for me was installing stock recovery jb via bootloader, afterwards a clean install of b014 again via stock recovery. And than I could install b125, also via stock recovery.
In short words:
1. Install stock recovery jb
2. Put (in your case) b506 to sdcard/dload folder
3. Reboot to stock recovery with automatic new installation of b506
4. Put b125 to sdcard/dload
5. Reboot to stock recovery with automatic installation of b125 withoutthe verlist fail.
This is the only way that worked for me from b014 to b125.
Sent from my P6-U00 using xda app-developers app

Install this Original_Recovery

You have to go back to stock recovery mode, do this using adb.
Then install KK Beta and then B125

RabbidZ said:
I updated to B506 but I dont have Gapps anymore. So I want to downgrade to B125 or B132 but both failed at checking verlist. What can I do.
I am also not able to boot in Fastboot mode with adb and Power + Volume Down. :crying:
Click to expand...
Click to collapse
To revert back on 4.2.2 flash first that: http://dl.vmall.com/c01l4l4a2y#, after that you can flash 4.2.2 without issues.

Downgrade B506
Hello,
very you please advice!
I downloaded and installed onto your phone p6-U06 Huawei B506-firmware. It works without a problem, I would like to go back to 4.2 but unfortunately downgrade from 4.4 to 4.2 does not work. Shows me that says "huawei sd card update fail".
Can you please advise what should I do with this?
Thanks

pave26 said:
Hello,
very you please advice!
I downloaded and installed onto your phone p6-U06 Huawei B506-firmware. It works without a problem, I would like to go back to 4.2 but unfortunately downgrade from 4.4 to 4.2 does not work. Shows me that says "huawei sd card update fail".
Can you please advise what should I do with this?
Thanks
Click to expand...
Click to collapse
i have the same problem...

ThePro2014 said:
i have the same problem...
Click to expand...
Click to collapse
and solved it?

pave26 said:
and solved it?
Click to expand...
Click to collapse
Yes! Thank you! firstly i downloaded the Emui 2.0 (In the up Link!) and i flashed it, With this i update de recovery, and then y flashed the b118cn !:laugh:

ThePro2014 said:
Yes! Thank you! firstly i downloaded the Emui 2.0 (In the up Link!) and i flashed it, With this i update de recovery, and then y flashed the b118cn !:laugh:
Click to expand...
Click to collapse
thank you, where you downloaded( Emui 2.0) it?

pave26 said:
thank you, where you downloaded( Emui 2.0) it?
Click to expand...
Click to collapse
Look.
1-Firstly With the phone download this:
http://dl.vmall.com/c01l4l4a2y# when you are here press the blue booton and the download are in coursing.
2-then, when the download is finished, you go to download folder and extract the .zip archive, and then put the dload o your external sd!
3-after that,you have to turn off the mobile. and the method of the 3 buttons (vol - and vol + power) the recovery will be updated!
4 - after the end of the flashing restarted again, with that before we get We traveled for updated repair fail.
5-'ll be back on the B506, now just stick a stock with dload on the external card and the 3 buttons you flash the stock rom that you have chosen with JB! regards :good:

Thanks ,,,,, it works :good:

If you want to downgrade listen to Alex - he knows what he is talking about!
See here for a little more info: http://forum.xda-developers.com/showpost.php?p=51694739&postcount=6
alex.79 said:
To revert back on 4.2.2 flash first that: http://dl.vmall.com/c01l4l4a2y#, after that you can flash 4.2.2 without issues.
Click to expand...
Click to collapse

I can't download from that link. anybody knows another link ?Thank you !

Morar Ioan Cornel said:
I can't download from that link. anybody knows another link ?Thank you !
Click to expand...
Click to collapse
Here has the fast mirror: https://mega.co.nz/#!9oEHUTiR!uVKEq6PYefO-p4_kJcJpHw2luWZT8QZ5yrnedx4rug4

thanks !!!

Falcifer said:
If you want to downgrade listen to Alex - he knows what he is talking about!
See here for a little more info: http://forum.xda-developers.com/showpost.php?p=51694739&postcount=6
Click to expand...
Click to collapse
I was testing the ART mode on the P6. I replaced the two system files. After some misbehavior of the ROM I wanted to go back to the B125. When doing a factory reset I am stuck on the Startup-Agent when choosing the WLAN(It stops and reverts to Language select -> so loop)
Can I flash this just with TRWP from dload folder on my SD-Card?

RabbidZ said:
I updated to B506 but I dont have Gapps anymore. So I want to downgrade to B125 or B132 but both failed at checking verlist. What can I do.
I am also not able to boot in Fastboot mode with adb and Power + Volume Down. :crying:
Click to expand...
Click to collapse
I have same problem, after upgrading to B506, mobile network doesnt work!!
Any one else has same problem?

[HOW-TO][GUIDE] Downgrade 4.4 -> 4.2 / Change from Chinese to International ROM

Since everybody knows how to upgrade OTA or from LOCAL UPGRADE and go from 4.2 to 4.4 I've decided to let you know how to easily downgrade from 4.4 to 4.2 AND / OR change from Chinese to International Huawei Firmware!
The method I describe here, I've found in some German forums after long search. It really works! 100% tested on my device Ascend P6-U06!
!!! CAUTION !!!
Before you begin, you must be sure you have STOCK recovery, NOT TWRP one!!! This flashable files work and can be flashed only thru STOCK recovery!
If you have TWRP recovery and don't know how to go back to STOCK one, look the SECOND POST in THIS thread and follow the steps there, before you begin this procedure! ONLY after you're done with turning back your STOCK recovery and you're sure of that, you can continue with the following steps:
To Downgrade from Android 4.4 to Android 4.2 / Switch from Chinese to International ROM, do the following:
1. Download this (Unicom 2.0 Downgrade Flashable ZIP) and flash it thru STOCK RECOVERY - https://mega.co.nz/#!ZYVixBqa!JNMLRB2DUVKlGpZVqPJbIsdbVPijks7r1Mtk46KGrmE
This is a 240MB archive, also known as Unicom 2.0 - something like ROM, but it is not an entire ROM, but just part of it, that must be flashed thru stock recovery. You must unzip it, take the dload folder that is inside and put it on you sdcard. Than you can flash it like a local update thru the updater, or you can forcefully flash it - pres power+ volume down+ volume up and it will take you directly to flashing updates thru stock recovery. When you flashed it, you can once again boot normally into you Android device. Now you must take dload folder from the B132 zip (from the link below), once again put it on your sdcard and flash it again using the same methods again thru stock recovery. The cool thing is that the first little flashable zip allows you not just to downgrade from 4.4 to 4.2, but also change from China to International ROMs. So when you're finished flashing this thru stock recovery, flash the official international B125 or B132, wait for the system to install and boot into android. When it is finally booted, you can flash B510 or B512/513 - whatever you want. In my case when I downgraded to B132, after the first boot the system prompted me, that it can be updated directly to B520 OTA. I've updated and now I am once again with International firmware​
2. Download this (B132 International 4.2 Firmware) and flash it thru STOCK RECOVERY ONLY if you already flashed the file in the step above! - https://mega.co.nz/#!5JkAzKpB!nFqfHIHfWo6EO4XPqjO3Gga6a3XWWnqqZxZDZpzAdWE
3. Boot into Official Huawei Android 4.2 firmware and check for update OTA. If you have one - install it. If you don't - you can flash B510 or B512/513/etc...
Enjoy International firmware line again! This method can also be used just to downgrade form Android 4.4 to Android 4.2!
Files are not flashable thru TWRP - please, use ONLY Stock Recovery!
------------------------------------------------------------------------------------------
Please, hit THANKS, if this thread helped you!

question: which stock recovery should i take if i have b635 (there is no available official b635 rom - only repack)..
i want to downgrade because i want to get the b520 fw..
maybe you have an advice..
thanks in advance..

blueIBI said:
question: which stock recovery should i take if i have b635 (there is no available official b635 rom - only repack)..
i want to downgrade because i want to get the b520 fw..
maybe you have an advice..
thanks in advance..
Click to expand...
Click to collapse
Just try with the stock B510 recovery from the second post in the TWRP recovery theme! I think stock recovery is the same for all 4.4 ROMs and it doesn't matter which one. I recommend the one that I told you about! Should work! I was with Chinese B706 ROM and TWRP. To downgrade I've flashed the B510 stock recovery first and then - step by step as I wrote above.

thanks..will try to do that..

blueIBI said:
thanks..will try to do that..
Click to expand...
Click to collapse
I have a question for you - I see that you modified the .prop file for the local channel, to get louder sound in headphones (from your signature). I've tried to do this today, but when I try to modify the file every time it says - cannot save changes, file cannot be modified, changes not saved! I have root and I've mounted / and /system as writable! I can edit build.pro without any problem and save the changes, but this file - I can't! How did you edited it and how can I edit it too?
Thank you!

UP!
Moderators, please consider to make this thread sticky / important! Thank you!

did not work for me..
i made the following:
flashed stock recovery from b510
took a fresh 4gb sdcard with dload folder on it..inside this folder was the update.app from the unicom rom..
then turned off device..
then pressed power,vol + & - together and held it 'til the recovery screen with yellow writing appeared..
it started to flash..but on the point where the verlist check begins it tells me "fail"!!!..
so what to do now???
i know this procedure..did it with the b506 rom and it worked..but with the b635 rom it won't work..

blueIBI said:
did not work for me..
i made the following:
flashed stock recovery from b510
took a fresh 4gb sdcard with dload folder on it..inside this folder was the update.app from the unicom rom..
then turned off device..
then pressed power,vol + & - together and held it 'til the recovery screen with yellow writing appeared..
it started to flash..but on the point where the verlist check begins it tells me "fail"!!!..
so what to do now???
i know this procedure..did it with the b506 rom and it worked..but with the b635 rom it won't work..
Click to expand...
Click to collapse
Try to flash B706 Chinese EMUI 3.0 new Development edition ROM from the official Huawei web site. If you flash it over the B635 successfully, then you must be able to do this procedure to turn back into international line of ROMs and to B132 4.2 ROM. after that you can flash B510 again. Try this method! I'm pretty sure that it will be possible to flash B706 directly over B635, even than that in the official website it is recommended to update only from B508SP02 official chinese rom. I had success with updating directly to B706 from B512, but if you can't go from B635, try to flash B508SP02 first, than B706 and than downgrade! Should work! Good Luck!

got it..
i just had to flash the b125!!!
so easy..i just flashed the stock recovery of b510..made a force update with the b125 (not the p6 unicom 2.0!!!!)..and now i just upgrade my p6 to b520 via OTA!!!
thanks for your help and time!

blueIBI said:
got it..
i just had to flash the b125!!!
so easy..i just flashed the stock recovery of b510..made a force update with the b125 (not the p6 unicom 2.0!!!!)..and now i just upgrade my p6 to b520 via OTA!!!
thanks for your help and time!
Click to expand...
Click to collapse
You're welcome!

ThunderBird891 said:
Try to flash B706 Chinese EMUI 3.0 new Development edition ROM from the official Huawei web site. If you flash it over the B635 successfully, then you must be able to do this procedure to turn back into international line of ROMs and to B132 4.2 ROM. after that you can flash B510 again. Try this method! I'm pretty sure that it will be possible to flash B706 directly over B635, even than that in the official website it is recommended to update only from B508SP02 official chinese rom. I had success with updating directly to B706 from B512, but if you can't go from B635, try to flash B508SP02 first, than B706 and than downgrade! Should work! Good Luck!
Click to expand...
Click to collapse
You installed the b706 on b512 ??
Why did they say that to upgrade only on b508
After installing are you facing any problems
Plz reply
Sent from my HUAWEI P6-U06

macklon said:
You installed the b706 on b512 ??
Why did they say that to upgrade only on b508
After installing are you facing any problems
Plz reply
Sent from my HUAWEI P6-U06
Click to expand...
Click to collapse
No. No problems at all. I think just the upgrade took a little while that usual but it flashed like charm over the B512 without any problems! I think the flashing from B508 is just a recommendation, because the B508SP02 is the latest chinese ROM, and this B706 is Chinese developers edition...

ThunderBird891 said:
No. No problems at all. I think just the upgrade took a little while that usual but it flashed like charm over the B512 without any problems! I think the flashing from B508 is just a recommendation, because the B508SP02 is the latest chinese ROM, and this B706 is Chinese developers edition...
Click to expand...
Click to collapse
So from b512 to b706 with dload and update
Sent from my HUAWEI P6-U06
---------- Post added at 09:23 AM ---------- Previous post was at 09:21 AM ----------
Which Rom are you using pltl
Sent from my HUAWEI P6-U06

macklon said:
So from b512 to b706 with dload and update
Sent from my HUAWEI P6-U06
---------- Post added at 09:23 AM ---------- Previous post was at 09:21 AM ----------
Which Rom are you using pltl
Sent from my HUAWEI P6-U06
Click to expand...
Click to collapse
That's right! Download the official B706 from Huawei EMUI website, unzip it, put the dload folder in you sdcard and then i recomend to make Local update first. If it doesn't want to update thru local update option in the Update Application, then try with forceful update - press and hold power + volume up + volume down and wait until phone boots into stock recovery mode! The update can only be done with stock recovery! If you're on TWRP, that you must go back to stock!

**** uc browser sucks
I kept to download b508 due to some problem I have to pause it only 36mb was remaining and when I resumed it showed a error was not able to resume the download so I re downloaded the b508 it got downloaded now
So kept to download b706 the same thing happened only 50mb was remaining for the download to complete it showed a error again but this time I did even pause ****
And now someone told me we can update b706 on b512 no need of b508 ****
Today ill download b706 on chrome
Sent from my HUAWEI P6-U06

Hi,in my Huawei Ascend P6-U06 i installed firmware B513+EMUI 2.3.
I tried to downgrade with this method but it fails when i flash Unicom 2.0 (i follow the instructions:download it..unzip then put UPDATE.app in dload folder of my sdcard).When i flash it,itfails(i have Stock Recovery,never installed TWRP).
Is this method valid also for B513+EMUI2.3?Or maybe i've done something wrong?
Any help is very appreciate..Thanks

gabrymed said:
Hi,in my Huawei Ascend P6-U06 i installed firmware B513+EMUI 2.3.
I tried to downgrade with this method but it fails when i flash Unicom 2.0 (i follow the instructions:download it..unzip then put UPDATE.app in dload folder of my sdcard).When i flash it,itfails(i have Stock Recovery,never installed TWRP).
Is this method valid also for B513+EMUI2.3?Or maybe i've done something wrong?
Any help is very appreciate..Thanks
Click to expand...
Click to collapse
Try to flash it forceful with holding all buttons together, or try to copy not only the update.app, but the whole dload folder from the archive. If it's not working, just try to flash B510 or B512 on top of B513 - this should work. After that you can try to downgrade to 4.2 again with the same method!

ThunderBird891 said:
Try to flash it forceful with holding all buttons together, or try to copy not only the update.app, but the whole dload folder from the archive. If it's not working, just try to flash B510 or B512 on top of B513 - this should work. After that you can try to downgrade to 4.2 again with the same method!
Click to expand...
Click to collapse
Thanks for your help!
Cause i'm a newbie,i explain you step by step what i've done:
I follow carefully your instructions(part 1),i try to flash it with local update,but i get message "fail"
After that,in stock recovery,i didn't reboot,but i move to option "apply update from external storage" and after a few seconds i have messages:
-wiping cache (at package request)...
-formatting cache
-cache wipe complete
-install from sd card complete
-cust copying files
-copy cust files successed!
It means that the process has been successful ??? If yes then i proceed to downgrade...
If no,i'll try with your advice to flash B510 or B512 on top of B513...

gabrymed said:
Thanks for your help!
Cause i'm a newbie,i explain you step by step what i've done:
I follow carefully your instructions(part 1),i try to flash it with local update,but i get message "fail"
After that,in stock recovery,i didn't reboot,but i move to option "apply update from external storage" and after a few seconds i have messages:
-wiping cache (at package request)...
-formatting cache
-cache wipe complete
-install from sd card complete
-cust copying files
-copy cust files successed!
It means that the process has been successful ??? If yes then i proceed to downgrade...
If no,i'll try with your advice to flash B510 or B512 on top of B513...
Click to expand...
Click to collapse
The process is successful! You must now reboot an go in your android. Now you can copy the other firmware (b510) to your dload folder in sdcard and then try to downgrade! It should work fine!!!

ThunderBird891 said:
The process is successful! You must now reboot an go in your android. Now you can copy the other firmware (b510) to your dload folder in sdcard and then try to downgrade! It should work fine!!!
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Ok,downgraded with success! Now i receive an OTA upgrade to western europe B520 but i think i'll wait for the moment...
Thanks ThunderBird for your help,very appreciate!

I lost my official running system

My phone was routed and i tried to install the last update from huawei then it stuck in the recovery mod sp i had to install an unofficial cm13 and now i want to return to huawei official system rui 4.01 what should i do ?

Return to official
Simpro said:
My phone was routed and i tried to install the last update from huawei then it stuck in the recovery mod sp i had to install an unofficial cm13 and now i want to return to huawei official system rui 4.01 what should i do ?
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Click to collapse
If you already downloaded official firmware for your model, put it on root folder on your sdcard or internal memory, in folder named "dload" (without quotes). It should contain two files: recovery.img and UPDATE.APP. Then turn off your phone, and turn it on with holding Power+Volume Up+Volume Down. Wait for install to finish, it will reboot itself when done. You will lose all your data on internal storage and root, so you will need to install TWRP and SuperSU again if needed.

What if it stuck again in twrp like the first time ?

Simpro said:
What if it stuck again in twrp like the first time ?
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Recovery.img in dload folder will replace TWRP with default Huawei recovery. Also, i was stucked in earlier TWRP recovery, with version 3.0.2-0 it was ok.
If you don`t have need for root, rom will work with default recovery.

Ok thank you i will try it

Where i can find a stock firmware for gx8 (i'am from morocco)

Simpro said:
Where i can find a stock firmware for gx8 (i'am from morocco)
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Hm, not sure, regional Huawei website for Morocco doesn't list GX8, you could try with rom from this forum: https://forum.xda-developers.com/gx8/how-to/g8-g7-plus-official-roms-europe-t3294362 .

it will be in middle east like my device
http://consumer.huawei.com/kw-en/support/products/downloads/detail/huawei-g8-kwen.htm?id=84325