Huawei P9 Lite VNS-L31 no Fastboot, no ADB, no Recovery, no Force-Upgrade

[bahador_b_92]

I tried to do a rollback from Android Nougat to Marshmallow on my VNS-L31C432B370. So I downloaded the Rollback-Package (Intermediate Package) from Huawei website and also the full B160 package. I put the first UPDATE.APP ind dload folder in root of my SD card and the tried holding Vol+ and Vol - keys and then the power key for around ten seconds. The force upgrade screen appeared and applied the UPDATE.APP and restarted the phone however as I have bricked this phone before, I remember that after the first restart there should come a "user reset" process to earse some data! This didn't appear and instead it got stuck on the screen which says bootloader is unlocked and gives 3 options. I waited a little and then restarted the phone with holding the Power key and tried to the same key combinations to redo the force upgrade process, but it just didnt't work! No matter how many times I tried the same thing that took me to force upgrade mode once before, it just doesn't work anymore! I can see that the phone trying to go recovery mode as the boot prompt screen changes from having 3 options to none, but still hangs on your device is now booting...

1. Bootloader was unlocked
2. FRP was unlocked
3. Chinese TWRP was the recovery

I can't make the phone to be detected by fastboot or adb as it apparently doesn't boot far enough to be detected by adb or fastboot! I also have installed the correct adb usb drivers for my device and I have the latest ADB & Fatsboot minimal on my Windows 10 PC!

Last time it took me a frustrating time of 10+ hours to find a way to bring it back to life, now I don't know what to do when the even the force upgrade is not working! I also let the phone to run out of battery and tried again, but still no luck.

P.S: When I try to enter force upgrade mode, it vibrates two times before showing the Huawei logo and going to boot/info screen!

 

[bahador_b_92]

I managed to access the fastboot using the 3 button method in cold boot. Hold the Power key until the screen goes off and then release and hold down the Vol- key and immideately connect the usb cable to PC right before it vibrates or exactly when it vibrates (it's a matter of timing), and bingo you are in fastboot and you can flash system.img, recovery.img, cust.img, cache.img and boot.img from there, but this is not how I revived my phone. I used the 3 button method again when the phone was charged for like half an hour or so and the did the same cold boot trick and I could boot into the force upgrade environment (strangely this still didn't work whitout connecting the usb cable to PC), but it somehow didn't want to read the UPDATE.APP that I had in dload folder on my SD card and wanted to have it from my PC (I just felt it nad there was no indication of it ) so then I installed the DC Phoenix tool and payed 15 euros to be able to inject the complete UPDATE.APP to my bricked phone and the installation went well to 99% and failed, but I rebooted the phone and I could boot normally. Just to make sure I did a factory reset afterwards. Hope this helps.

 

[romeo_coi]

I managed to access the fastboot using the 3 button method in cold boot. Hold the Power key until the screen goes off and then release and hold down the Vol- key and immideately connect the usb cable to PC right before it vibrates or exactly when it vibrates (it's a matter of timing), and bingo you are in fastboot and you can flash system.img, recovery.img, cust.img, cache.img and boot.img from there, but this is not how I revived my phone. I used the 3 button method again when the phone was charged for like half an hour or so and the did the same cold boot trick and I could boot into the force upgrade environment (strangely this still didn't work whitout connecting the usb cable to PC), but it somehow didn't want to read the UPDATE.APP that I had in dload folder on my SD card and wanted to have it from my PC (I just felt it nad there was no indication of it ) so then I installed the DC Phoenix tool and payed 15 euros to be able to inject the complete UPDATE.APP to my bricked phone and the installation went well to 99% and failed, but I rebooted the phone and I could boot normally. Just to make sure I did a factory reset afterwards. Hope this helps.

Can You please explain me a bit clearly about what is the exactly time when we connect device to pc because the device always vibrates 2 times when it startups. And in your case did You connect usb cable to the device firts then connect to pc or connect usb to pc first? Because I see sometime it's really matter where we connect the usb cable first. Last thing I wanna ask: did your phone hold a charge during the brick? Mine doesn't, the led keep blinking red, device charge a little bit and startups then stucking and then turn it off by low battery. It was took me 2 days and I think I need to send device to a repair service until I found your topic, I have exactly symptom as You.

 

[harryhcs]

Can You please explain me a bit clearly about what is the exactly time when we connect device to pc because the device always vibrates 2 times when it startups. And in your case did You connect usb cable to the device firts then connect to pc or connect usb to pc first? Because I see sometime it's really matter where we connect the usb cable first. Last thing I wanna ask: did your phone hold a charge during the brick? Mine doesn't, the led keep blinking red, device charge a little bit and startups then stucking and then turn it off by low battery. It was took me 2 days and I think I need to send device to a repair service until I found your topic, I have exactly symptom as You.

Mine does the same. Battery does not seems to charge. I cannot get into fasdtboot or recovery. aAAAAAH!!!!!

 

[strykrmas]

I'm having the same problem. I have L23. It started when i attempted to wipe all partitions through twrp and flash nougat when it all failed. I then attempted to relock and then unlock the bootloader and since then ive been getting the logo screen with no fastboot or recovery. Ive tried the three button method and no lock. everything ive tried it keeps going back to the logo screen. plz help...

 

[strykrmas]

By the way my bootloader is locked....

 

[strykrmas]

I'm having the same problem. I have L23. It started when i attempted to wipe all partitions through twrp and flash nougat when it all failed. I then attempted to relock and then unlock the bootloader and since then ive been getting the logo screen with no fastboot or recovery. Ive tried the three button method and no lock. everything ive tried it keeps going back to the logo screen. plz help...

OK I've managed to revive my vns-L23. It was running nougat c605b362 but I kind da grew tired of it having been running c605b120. On nougat, time and time again I attempted to install xposed and otg previllages but that proved futile. So I attempted to try my own method of rollback and that's when I getting stuck on the first boot logo.
You see what I did was...
First I went into twrp and wiped the partition (exclusive of SD card).
Then I started flashing .img files that I had extracted from the update. App of b120 hoping that I wudve rolled back.
After trying to flash system. Img it failed.
Cust.Img also failed.
So I decided to relock the bootloader and try to unlock it again...
The phone immediately got stuck on the first logo and showed no signs of coming out of tht...
For 8 hours I had no hope of restarting my phone, until d battery died and was able to boot into fastboot.
I again unlocked the bootloader but now with a dead battery everything seem grim.
Until I figure it out... The only way to get it back up n running was to flash d same firmware it had before. So viola right back to where I've started...
So.... Is there anyway to roll back vns-L23 from c605b362 to c605b120...
Help...!!

 

[msilasoft]

Flash it with " hde flasher " via test point