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OTA failed with BootLoader locked/Stock Recovery !?

Hi Guys, I need some help
I am on MT-LV09xxxB137SP03/KitKat 4.4.2/EMUI 3.0 build. Recently I got a notification about an intermediate update before LolliPop: xxxB145: so I tried a OTA update which failed (no specific error, just "software update failed"). I downloaded manually the update, put that in the dload folder and tried a local update, failed for the same reason.
My phone is rooted via KingRoot (amazingly worked) but the bootloader is locked, so I wonder why the update fails.
With KingRoot there is an option to "Remove Root Permission" which I tried, thinking that it was the culprit. Then I tried to update and still it failed.
I was under the impression an OTA update fails only with a unlocked bootloader/custom recovery, but this does not seem the case. Any idea about what should I do?
Thanks,
Anubis
.

Hey man,
Just wanted to let you know: I have the EXACT same problem. Huawei AM7, KingRoot, OTA xxxB145 fail. I cannot further help, as I have no solution myself.
Hope someone can help.

Flash the stock image. Kingroot may have left some files behind even though you "uprooted" this the system is still seen as modified for purposes of the ota.

Milly7 said:
Flash the stock image. Kingroot may have left some files behind even though you "uprooted" this the system is still seen as modified for purposes of the ota.
Click to expand...
Click to collapse
Did a factory reset, still software update fail. Then tried to install stock rom over the stock rom, but software update still fails...

Did you try local update from internal or external SD card?

Yes, tried that, but same 'software update fail' problem...

Are you sure that you are flashing the correct file for your specific variant? You cannot flash TL10 on L09, etc. It will give the error if you do that.

I found the problem:
1) When installing an OTA there is a check on the file system first and if it fails, the update is aborted
2) KingUser/KingRoot leaves the file system in a dirty state (there is a kinguser.apk left in /system/app) so the check fails
3) to install a clean OTA you need to have a clean recovery so you need to:
3.1) unlock the bootloader (to be able to install a stock recovery)
3.2) download the update (e.g. ...B145) you want to install
3.3) use the Huawei extractor to get the recovery.img file from the package
3.4) flash the stock recovery
3.5) upgrate with the OTA
I discovered it step by step. Basically you need to unlock the bootloader to fix things and therefore it is a waste of time to user KingRoot/KingUser in the first place: but faster/cleaner to unlock the bootloader and install SuperSU.
Anubis

Still doesn't work I had the same but also had twrp recovery, I have my unlock code but no matter what adb I use I get remote command not allowed for trying to get stock recovery back or parse file failed with unlock code.
Any ideas would be much appreciated.

Anubis1965 said:
Hi Guys, I need some help
I am on MT-LV09xxxB137SP03/KitKat 4.4.2/EMUI 3.0 build. Recently I got a notification about an intermediate update before LolliPop: xxxB145: so I tried a OTA update which failed (no specific error, just "software update failed"). I downloaded manually the update, put that in the dload folder and tried a local update, failed for the same reason.
My phone is rooted via KingRoot (amazingly worked) but the bootloader is locked, so I wonder why the update fails.
With KingRoot there is an option to "Remove Root Permission" which I tried, thinking that it was the culprit. Then I tried to update and still it failed.
I was under the impression an OTA update fails only with a unlocked bootloader/custom recovery, but this does not seem the case. Any idea about what should I do?
Thanks,
Anubis
Click to expand...
Click to collapse
u need to be unrooted to proceed ota. ..

Okay,
I have been trying over and over but there is no way I can perform an OTA. Here's the situation:
- The bootloader is unlocked
- Current Firmware: MT7-L09 ... B137SP03. According to the updater it should go with MT7-L09 ... B145
- OTA fails: on WiFi, local update (SD), forced (three buttons)
- In the systems/app folder I have this "KingUser.apk" app, has been left hanging there by KingRoot when I removed it
I was told to reinstall the stock recovery and try a local update, here's what I did:
1) I downloaded again the current FW (B137SP03) from here: http://www.huaweiblog.de/huawei/firmwareupdate-b137-fuer-mate-7-ota/
2) extracted update.app, opened with the Huawei Extractor, got recovery.img from update.app
3) rebooted the Mate 7 (vol down + power) in fastboot mode
4) flashed the stock recovery: fastboot flash recovery recovery.img, got an ok
5) rebooted
6) put update.zip in the dload folder of the SD, performed a local update --> failed as usual
Is there anything I am doing wrong?
Anubis

Anubis1965 said:
6) put update.zip in the dload folder of the SD, performed a local update --> failed as usual
Is there anything I am doing wrong?
Anubis
Click to expand...
Click to collapse
"UPDATE.ZIP" ??? I wonder that stock recovery may flash a zip file.
Check elsewhere in this forum the matter of the trash files left by kingroot, intead...

tuddu said:
"UPDATE.ZIP" ??? I wonder that stock recovery may flash a zip file.
Check elsewhere in this forum the matter of the trash files left by kingroot, intead...
Click to expand...
Click to collapse
Did you read what I wrote?
The OTA is called update.zip and you can perform an update by putting it into the dload folder of the SD card and then using the updater or with a forced update (three buttons boot).
The recovery file is called recovery.img and it is inside the archive update.app which is inside update.zip
Anubis

Correct. But you wrote "put the update.zip file in the SD folder".
I suppose you mean the EXTRACTED update.app file in the SD folder.
That's it.
Anyway, peace and love.

tuddu said:
Correct. But you wrote "put the update.zip file in the SD folder".
I suppose you mean the EXTRACTED update.app file in the SD folder.
...
.
Click to expand...
Click to collapse
No. I put the update.zip file in the dload folder of the SD card.
About removing KingRoot/KingUser after the self-removal option failed, I have only heard about installing SuperSu. Are you referring to it? Because that would imply to install a custom recovery, install supersu, clean-up, unroot via supersu, reinstall the stock recovery and then perform finally the OTA.
Paolo

:good:

oh well... Did everything (KingUser was removed with the support of SuperSuMe), reverted back to the stock recovery and guess what? Software update failed as before.
I guess I'll have to stay with my firmware until lollipop or a custom rom based on lollipop will come
Anubis

Anubis1965 said:
oh well... Did everything (KingUser was removed with the support of SuperSuMe), reverted back to the stock recovery and guess what? Software update failed as before.
I guess I'll have to stay with my firmware until lollipop or a custom rom based on lollipop will come
Anubis
Click to expand...
Click to collapse
Hello,
tuddu is wright. The file which must be put in the dload folder is update.app and no update.zip.

grofock said:
Hello,
tuddu is wright. The file which must be put in the dload folder is update.app and no update.zip.
Click to expand...
Click to collapse
I wish it would be that easy. It makes absolutely no difference whether I put in dload update.zip or its unzipped content.
the message is always "software install failed".
Anubis

Anubis1965 said:
I wish it would be that easy. It makes absolutely no difference whether I put in dload update.zip or its unzipped content.
the message is always "software install failed".
Anubis
Click to expand...
Click to collapse
You should do a clean install ( 3 buttons ) of the full B137 firmware, it was happening also with my phone and I solved the issue in that way.
After the flash you'll be on a clean stock B137 so you can put the "update.zip" in the "dload" folder ( it's an OTA update, not a full update.app firmware ) and be able to get the latest B145 :good:

[Guide] how to update mate 7 without getting error in recovery {update failed}

This guide is for all those who are getting error while updating their mate 7 manually either by local update option or by 3 buttons combo option.
here we go: ( for eg. consider mt7-tl10 model imternation version currently on any firmware and you want to install b123 firmware )
1. Extract recovery from new update.app to be installed i.e. b123 firmware.
2. flash it in fastboot mode.
3. now try to update using any of the option either local update or 3 buttons, it will run smoothly and you are done.
basically first we have to install recovery of the new version we want to install.
same can be followed to easily update to lollipop firmware.
hope this might help someone

Thanks - I was wondering what I was doing wrong since I can't update anymore either OTA, or local update or three fingers method, I constantly get the message "software update failed" and I am stuck with KingUser.apk ...
Can I ask I few more questions (I have changed ROMs in other mobile phones but not on the Mate 7)...
1) Do I need to unlock my bootloader to flash anything (I assume yes, my phone is still unlocked) ?
2) Do I need to use the Huawei Extractor (this one: http://forum.xda-developers.com/showthread.php?t=2433454)?
3) The name of the recovery is recovery.img (I guess so)?
Thanks a lot,
Paolo

Anubis1965 said:
Thanks - I was wondering what I was doing wrong since I can't update anymore either OTA, or local update or three fingers method, I constantly get the message "software update failed" and I am stuck with KingUser.apk ...
Can I ask I few more questions (I have changed ROMs in other mobile phones but not on the Mate 7)...
1) Do I need to unlock my bootloader to flash anything (I assume yes, my phone is still unlocked) ?
2) Do I need to use the Huawei Extractor (this one: http://forum.xda-developers.com/showthread.php?t=2433454)?
3) The name of the recovery is recovery.img (I guess so)?
Thanks a lot,
Paolo
Click to expand...
Click to collapse
1. Yes bootloader needs to be unlocked .
2. Yes, huawei extractor is required.
3. Yes it is recovery.img. You have to flash it in fastboot mode

My honor 8 refuse update

hello, i will try to explain my problem :
My honor was bricked by an error of flash.
I have "repair" it by a way found here on xda : flash boot.img, cust, recovery, system, and after i have could make the update by dload.
Then all was ok under the firmware LO9C432B131.
But now, i can't update to B360...
Before my brick, i had the ota update to B360... but now i have nothing....
If i try the update by dload, it says : "problem compatibility"
I have downgraded to B120 and ota update was good for B131. But nothing for B360
If someone can explain me...thank you so much (actually the phone is no rooted and relocked)

Hi there. Go through the entire rollback procedure and you will be fine: https://forum.xda-developers.com/honor-8/how-to/guide-downgrading-unlocked-rooted-twrpd-t3549281
Put the update.app file in a folder called dload on a SD card. If you haven't got one, flash twrp in fastboot and when in twrp you'll be able to transfer them to internal storage from your pc. Then follow the instruction above. That's how I unbricked mine. Good luck.

sysak said:
Hi there. Go through the entire rollback procedure and you will be fine: https://forum.xda-developers.com/honor-8/how-to/guide-downgrading-unlocked-rooted-twrpd-t3549281
Put the update.app file in a folder called dload on a SD card. If you haven't got one, flash twrp in fastboot and when in twrp you'll be able to transfer them to internal storage from your pc. Then follow the instruction above. That's how I unbricked mine. Good luck.
Click to expand...
Click to collapse
I don't think you understood what OP is saying. He successfully rolled back to MM but he cant go to Nougat anymore.

takichiman said:
I don't think you understood what OP is saying. He successfully rolled back to MM but he cant go to Nougat anymore.
Click to expand...
Click to collapse
Yes, but I believe the issue comes from manual flashing of partitions. I have also tried that when my phone was dead and the recovery and eRecovery always threw "package incompatible" error. I think restoring the entire file system to factory condition (which happens during the rollback process) is the sure best way to fix all issues.

Thanks for your answers,
I finally got the update with the charlie app...(not easy this method !)
But now i don't know if ota will be ok...
I will perhaps do the rollback as you said to restore the entire file system...

Reverting to stock [SOLVED]

I have been trying to revert to stock with no luck. What I want to do is install the latest update, but I can't because I had twrp installed. I flashed the original recovery. The problem is when I try to use eRecovery I get "Getting package info failed" error. when I try to download the b385 full update for the FRD-L04 I get a dead link. I was able to download the rollback package, but will I be able to get back to the latest version after I install the rollback package? when I try to use other update packages for my phone I get "Incompatibility with current version" error. Do I need to lock my bootloader in order to update? The good news is that my phone works fine, bad news is that I can't up date.
build number: FRD-L04C567B385
Thanks

this link will help you
https://forum.xda-developers.com/honor-8/how-to/to-emui5-custom-roms-tested-openkirin-t3638445

alimir98 said:
this link will help you
https://forum.xda-developers.com/honor-8/how-to/to-emui5-custom-roms-tested-openkirin-t3638445
Click to expand...
Click to collapse
Thanks for the link, I just been to heck and back with this phone. first I uninstalled Magisk. After that my phone wouldn't boot, it would just hang on the blue screen after the initial boot screen. I tried to find a stock boot Image for my version. Once I installed that my phone would boot loop so I managed to get into fastboot and flash TWRP. Once in TWRP I restored my B360 backup and got my phone working again. Then I flashed the stock recovery. Tried to boot into the stock recovery but that wouldn't load. Some how I got it to install the rollback package and now i'm at version B300. Good news is I'm back to stock and can boot int the stock recovery. Time to see if I can update to the latest version.
Edit I think I might have a problem. It won't let me update also it shows my phone as "FRD-L04C900" not "FRD-L04C567" is there any way I can fix this?

srgrusso said:
Thanks for the link, I just been to heck and back with this phone. first I uninstalled Magisk. After that my phone wouldn't boot, it would just hang on the blue screen after the initial boot screen. I tried to find a stock boot Image for my version. Once I installed that my phone would boot loop so I managed to get into fastboot and flash TWRP. Once in TWRP I restored my B360 backup and got my phone working again. Then I flashed the stock recovery. Tried to boot into the stock recovery but that wouldn't load. Some how I got it to install the rollback package and now i'm at version B300. Good news is I'm back to stock and can boot int the stock recovery. Time to see if I can update to the latest version.
Edit I think I might have a problem. It won't let me update also it shows my phone as "FRD-L04C900" not "FRD-L04C567" is there any way I can fix this?
Click to expand...
Click to collapse
I think you will have to restore you oeminfo partition backup through twrp.

On mr FRD-L09, I had to relock my bootloader, then get the rollback package and put the .app on my SD card and hard flash it, then do the same with the rom .app file. Thet got me back to stock marshamllow, and I just let all the updates run through until I'm now on the latest.
Stock is missing some bits, and has some irritations, but the camera is sooo much better than custom roms, and GPS works, as does Android Pay etc. I've not bothered rooting, AdGuard does the ad-blocking and the rest is liveable.

Well I think I'm my phone is screwed. I can't boot into recovery and when it boots it bootloops once and then it is stuck on the "your device is unlocked and can't be trusted. Fastboot still works fine I can lock and unlock the bootloader. I can flash Recovery and TWRP in Fastboot but neither one will boot. I think I might have flashed the wrong update or it happened when I flashed the rollback package. I want to try DC Phoenix but they won't let me buy credits because my PayPal account is unverified. I have downloaded the "Honor 8_Firmware_FRD-L04_Android 6.0_EMUI 4.1_C567B122_United States_Nonspecific" from the hihonor.com site. I extracted it and flashed the recovery, boot, and system image through fastboot. The phone still won't boot into recovery or boot into the OS. Is there a way to fix this or is it time for a new phone.
Thank you everybody for your help.

Ok my phone is fixed. What I did was buy 15 credits for DC Phoenix and flashed the "Honor 8_Firmware_FRD-L04_Android 6.0_EMUI 4.1_C567B122_United States_Nonspecific" package. When I rebooted my phone it automatically went into ERecovery and downloaded and installed the B162 update. I was able to fully boot after that It updated to B360 and then B388.
Thank you everybody for your help.

srgrusso said:
Ok my phone is fixed. What I did was buy 15 credits for DC Phoenix and flashed the "Honor 8_Firmware_FRD-L04_Android 6.0_EMUI 4.1_C567B122_United States_Nonspecific" package. When I rebooted my phone it automatically went into ERecovery and downloaded and installed the B162 update. I was able to fully boot after that It updated to B360 and then B388.
Thank you everybody for your help.
Click to expand...
Click to collapse
How did you flash the file you mentioned above? Did you put it on the SD card and used TWRP?
Also, what is so special about that file?
I have the L14 (64gb US version) and just about the same exact problem you describe.
If you have any extra steps that would help me recover mine that would be great.

anosis said:
How did you flash the file you mentioned above? Did you put it on the SD card and used TWRP?
Also, what is so special about that file?
I have the L14 (64gb US version) and just about the same exact problem you describe.
If you have any extra steps that would help me recover mine that would be great.
Click to expand...
Click to collapse
Sorry for replying so late, hopefully you fixed your phone if not here is a link with some more information.
https://www.dc-unlocker.com/DC-Phoenix-flash-repair-tutorial
I followed the instuctions for the honor 7. I would recommend finding the full update firmware for your phone. It took me a lot of googling to find it. Make sure it is the correct firmware, you need to match the numbers before the B-- for me it was (FRD-L04C567) and for you it would be (FRD-L14????) I hope this helps.

hi sir
srgrusso said:
Ok my phone is fixed. What I did was buy 15 credits for DC Phoenix and flashed the "Honor 8_Firmware_FRD-L04_Android 6.0_EMUI 4.1_C567B122_United States_Nonspecific" package. When I rebooted my phone it automatically went into ERecovery and downloaded and installed the B162 update. I was able to fully boot after that It updated to B360 and then B388.
Thank you everybody for your help.
Click to expand...
Click to collapse
hi sir
I try to install "Honor 8_Firmware_FRD-L04_Android 6.0_EMUI 4.1_C567B122_United States_Nonspecific" this package in my honor 8 with dc phoenix but its not working, its flashing but its not booting, please help me.
my mobile model number is honor 8 frd-l04

sunneellkumar said:
hi sir
I try to install "Honor 8_Firmware_FRD-L04_Android 6.0_EMUI 4.1_C567B122_United States_Nonspecific" this package in my honor 8 with dc phoenix but its not working, its flashing but its not booting, please help me.
my mobile model number is honor 8 frd-l04
Click to expand...
Click to collapse
After you flash the firmware, you must format data with emui recovery, and it will boot up

After trying different methods, this one works
Download
1 .Honor 8_FRD-L04_Rollback_Package_from_Android7.0 to Android 6.0_C900B300
2. Honor_8_Firmware_FRD-L04_Android_6.0_EMUI-4.1_C567B122_United_States_Nonspecific
Put on dload (sd card) #1 after shutdown the phone and put on the folder dload (Sd card) #2. after reboot your phone starts with android 6.0

Try this
sunneellkumar said:
hi sir
I try to install "Honor 8_Firmware_FRD-L04_Android 6.0_EMUI 4.1_C567B122_United States_Nonspecific" this package in my honor 8 with dc phoenix but its not working, its flashing but its not booting, please help me.
my mobile model number is honor 8 frd-l04
Click to expand...
Click to collapse
Ok so i had the exact problem, im not sure if this will help but what I did was flash my cust recovery system and boot through bootloader, I then put the dload folder on my sdcard with the update.app in it, from there I put my phone into download mode so hold all 3 buttons until it goes into download mode. Once there it will automatically install the update.app, and you should be good to go. If not than go to recovery mode do a factory reset and wipe the cache and see if that works.

[GUIDE] Upgrade from EMUI 4.1/Android 6.0 to latest firmware

It took me 2 full days to finally successfully upgraded my ancient firmware (L09C16B170) to the updated version (L09C432B397). There are a lot pieces of information that I gathered from this forum and all over the internet that collectively helped me navigate this ordeal. Just want to share it with anyone who is in the same boat, although I know that P9 won't last for too long since P10 has been out for a while. However, if you still want to revive your P9, keep reading.
Requirement
Before reading, you need to understand ways of entering different modes of your P9 phone, which will be used many many times during your upgrade:
Enter recovery mode (also how you enter TWRP) - see this GUIDE
Enter fastboot mode - see this GUIDE
Enter manual upgrade mode (also called dload method; This is NOT TWRP method) - see this GUIDE. Please IGNORE any software or download information in this guide. I want you to refer to this guide for how to do it, NOT what to use or download!
You also need to download and know how to use ADB tool which is quite simple. Search the forum or google and you will find plenty of information and the download links. If you hate command lines, you can even use the GUI version from here.
You will probably also need to use Firmware Finder for Huawei (HWFF) to download firmware of interest for manual update during this process. HWFF is an app that can be installed for free via your phone Google Play Store. The downloaded firmware is saved under the HWFF folder in the internal memory. You might need to unzip these files for upgrade via dload method or directly via TWRP method without unzipping. However TWRP method requires you to unlock the bootloader and install TWRP in the phone (see below for details).
First step - debranding
If you are already on C432xxxx, you might just skip this step. I followed this thread partially (Debranding Guide by Z-Blade), since the whole thing doesn't work for me 100%.
Z-Blade did a fantastic job describing how to debrand his C34 firmware to C342B361. My original version is C16B170 which is a South Africa branded firmware. But I found certain steps in this guide could be omitted and certain steps didn't work in my case. Here is my modified version based on Z-Blade's version:
1. Unlock your bootloader and install TWRP
How to unlock bootloader? Follow this GUIDE. Even though it's for Huawei Ascend XT. It works for P9 as well. You only need to complete Part 1.
After you unlock the bootloader, install TWRP. Depending on which firmware version you're on, the version of TWRP that might work for your device changes. I encountered numerous booting loops due to incorrect version of TWRP. Finally I found that these three versions work for me (3.1.0-0, 3.1.1-0, 3.1.1-1). Always go with the highest version first (3.1.1-1). If you find yourself stuck in the booting screen, long press your power button until you get out of it and install another version of TWRP. Please go to TWRP official website to download TWRP for Huawei P9. Follow this GUIDE to install TWRP recovery on your phone.
2. Flash OEM info file for C432
After you unlock the bootloader and install TWRP recovery, download oeminfo-huawei-p9-eval09-c432.zip from this THREAD and flash it via TWRP method.
3. Flash C432B136 firmware
Download and flash the dload-huawei-p9-eval09-eva-b136.zip via dload method from this thread. After flashing and rebooting your phone, you should be on the L09C432B136 firmware. NOTE: If it boots up to a white screen asking you to enter password, reboot into recovery by holding volume up when you powering up your phone, do a wipe partition and factory reset. You may need to reboot your phone a number times before the phone boots up correctly.
Up to this stage, you have debranded your phone to an european version.
Second step - stepwise firmware upgrade
1. Update from B136 to B166 or B182
As mentioned in Z-Blade's original post, many people will not be able to directly update from B136 to B182. I am one of them. Go into the updater in the phone setting, refresh "check for update". If you can receive B182 update, by all means go for it. If you only receive B166 update, go for it as well. After B166 update and rebooting your phone, check updater again to see if you receive B182 update in the Settings menu. If this method does not work, manually update to B182 by following the steps here via dload method.
2. Update firmware from B182 to B360/361/378 and also upgrade OS from Android 6.0/EMUI 4.1.x to Android 7.0/EMUI 5.0
According to Z-Blade, "After your phone has rebooted and you are on the B182 firmware, you need to now update the firmware to B361 via Huawei Updater 2.0". However, in my case, I tried many times and always failed at this step. I found a workaround by updating to B360 instead of B361. Please follow this GUIDE to update to B360 or B361, whichever works for you. However, please pay attention to following change that I found critical:
- The version of Huawei HiSuite is critical for the success in this step. The GUIDE provided Hisuite download link (version 5.0.0.301_OVE). However, it does not work together with Huawei Updater 2.0 in my hands. This error has wasted me almost half day. Instead, I finally found out the problem and went to HERE to download the version 5.0.1.300 and it finally worked
- However, if even after HiSuite and Updater both work together fine the update does not proceed successfully (the updater might get stuck), you need to update it manually via dload method. Search EVA-L09C432B360 or EVA-L09C432B361 in Firmware Finder for Huawei as mentioned above and download the Full-OTA version (~2G). After download, move the corresponding folder containing firmware zip files under "HWFF" folder in the internal memory to the external SD card. Unzip the firmware file and update your phone using dload method. You may also try TWRP method which can install zip files directly, but at this point, you bootloader will be re-locked and TWRP will be gone. You need to unlock the bootloader and re-install TWRP again as mentioned above.
After you successfully update the firmware to B360 or B361, now you should have Android 7.0 and EMUI 5.0 on your phone. Now go to the updater in your phone setting. You should receive B378 OTA update. Proceed with the update...
You might not need to strictly follow following steps to update your phone to any firmware beyond B378. However, since a lot of new ROMs are based on B380+ or even B390+, if you want to use those, you might need to further update your firmware first.
2. Update firmware from B378 to B383
After updating to B378 and rebooting your phone, check if your phone receives B383 update OTA. If yes, proceed. If not, go to HWFF, download B383 Full-OTA firmware and update via either dload or TWRP method.
3. Update firmware from B383 to whatever later version
After successfully updating your phone to B383, you basically can flash your phone with anything firmware and ROMs built on B380+. I find it unnecessary to update to B386. What I did was that I directly updated from B383 to B394 by following this GUIDE. Since I wanted to try BlueWei 5.7 which is based off B397, I also followed the same guide to update my firmware to B397 before flashing BlueWei ROM.
Now please enjoy all kinds of new ROMs and the fast, revived P9. After this update, my P9 is super smooth (the original firmware and OS was utterly slow and sluggish) and I think I will keep using this phone until it really can't keep up with the hardware requirement of new apps etc.
Hope my guide is helpful!

Nice job to update things and summarize all together. Few comments, though
- Not necessary to go back to c432 b136, to b182 is enough:
https://forum.xda-developers.com/showpost.php?p=75105886&postcount=280
https://forum.xda-developers.com/showpost.php?p=72153575&postcount=2
- For Nougat, please use Huawei P9 Nougat TWRP:
https://forum.xda-developers.com/p9/development/twrp-t3565703
- For DLOAD method, FullOTA-MF-PV versions should be used
- Besides the two methods listed to initiate DLOAD update, there is also a third one:
'Dial': *#*#2846579#*#*
Project Menu will open, select Software Update