i have moto g4 plus recently i rooted it every thing worked fine
but when i applied the nougat ota upgrade i m unable to downgrade it to mm stock ROM
neither able to lock boot loader even cant flash it with recovery
every time i flash it it shows "preflash validation failed " and "piv sign not valid " for the boot and recovery image
pls guys help me
my stock rom is not corrupt
one more thing it also display "security virsion downgrade"
Have you tried following the guide on:
http://forum.xda-developers.com/moto-g4-plus/how-to/moto-g4-plus-xt1643-updated-signed-t3460695
Maybe it can help you in the right direction... Just maybe. Hope that it helps
Related
Hi there! I have this question which I'd love to have answered because I've been on this issue for around 2 days straight.
Long story short:
Tried to flash custom recovery using fastboot, didn't work because bootloader locked
Kept on trying the unlocker apps, none of them even installed fully (THIS WAS WHEN I WAS STILL ON LOLLIPOP)
Somehow, at some point, I just randomly rebooted and BOOM THERE WAS TWRP (Sorry, I don't remember how exactly I managed that. As far as I remember, I was only using fastboot and nothing else)
Flashed CM 14.1 unofficial, device gave an error message regarding boot.img (something like "could not load boot.img"
Used stock ROM to flash OTA Android 6.1
Now the Asus unlocker app downloads but on reboot it says "error: unlock fail !!!"
Obviously, fastboot is unable to flash a recovery right now. I tried ignoring the error message and rebooting to recovery to stop the device from loading the stock recovery again but the device still loads the stock recovery.
I'm really tired
P.S: NO, there is no Enable OEM option in my Developer Options menu and YES, I have all the drivers necessary.
Did you get anywhere with this? I have a similar problem except that I couldn't flash Android 6.1 because the vendor had flashed WW 5.0.2 on a CN phone without also updating the CN recovery to WW. So the update failed its consistency check.
I've got TWRP on there now, but can't unlock the bootloader in 5.0.2 - I think this is why TWRP can't flash anything. It can't see the update files, won't switch to external SD, etc. .
I also found and tried flashing a WW recovery but that didn't work either. I'm wondering now if I got the 615 software by mistake.
So,
It's about my friend's Moto X Play [unrooted, locked and using stock ROM (not sure what version as I can't boot into the OS)]. One day, her phone ran out of battery and now it isn't booting up to the OS. It says "Startup failed: failed to validate boot image" (see attached image).The phone is purchased in India so I think it's the XT1562 Dual SIM.
The steps mentioned on the screen didn't work.
Also, I tried to flash the firmwares: MPDS24.107-52-5 and MPDS24.107-70 for XT1562. When I try to flash I get the error "preflashvalidation failed".
i would have unlocked if still possible, flashed twrp then a custom rom
Urgent help needed as I'm leaving the country at the end of the week o any help is appreciated!
Just successfully rooted my device:
Black, Unlocked, PRA-LX1, UK, Dual SIM
After doing so successfully, I attempted to flash LineageOS from the following link:
https://forum.xda-developers.com/p8lite/p8-lite-2017-development/rom-lineageos-15-1-hi6250-devices-t3811583
Although when I completed Step 6 on the Installation guide and rebooted the phone, I started seeing the message:
------------------
ERROR MODE
Attention!
Please update system again
(Green Android picture)
Error!
Func NO : 11 (recovery image)
Error NO : 2 (load failed!)
------------------
Despite this, I didn't receive a box with my phone due to being second hand, and I didn't see the model number on the receipt as it was from a reselling store. I didn't remember to note down the specific model number
It'd be extremely helpful if someone could possibly help just from the device description above as I'm not sure if it's safe for me to just attempt to flash every stock rom for every other LX1 device out there.
---------------------------------------------------------------
Update:
To restore this, I connected via fastboot with a working USB & flashed an original stock recovery in the video found here
(Just in case their download link ever goes down, I have uploaded the same copy to my MEGA, found here)
The recovery installed fine when using the command
fastboot flash recovery oeminfo.img
Click to expand...
Click to collapse
Whenever trying to flash any other recovery such as twrp before this fastboot stuck on a loading icon.
The stock recovery seems to be downloading the original firmware, too.
PRA-LX1C432B202 is presumably the model.
Both the bootloader and FRA were unlocked when everything else was inaccessible.
Looks like the custom ROM's recovery that you've flashed is not compatible with PRA-LX1. Try to flash stock recovery. If not working, then flash stock firmware.
Thanks @Botar230!
I didn't see your comment until just now after deciding to edit this post since I've gotten a step closer to restoring my device.
Your solution was the method I used although I didn't know my phone model, so I found a random solution which just worked for my device, and the eRecovery seems to be downloading the stock firmware anyways. Thanks again
Before flashing this lineage os you should update to EMUI8 to get treble support, i suppose you was running EMUI5, hence the error mode.
After i flash the stock rom (its my mistake to do a downgrade the stock os) I get and OTA Update. I just updated it after that phone is not starting in boot or nothing responding only its flashing a light while charging. So then i Blank Flash with potter File i am getting an error 0 or something like waiting.Hope So it will work on potter Blank Flash File but i cant find that file can anyone have the mirror file it will help to live my phone thanks..........sorry for band english
Hello, a friend asked me for help unbricking his phone, apparently he downgraded to marshmallow, had some wifi troubles, tried to upgrade back to nougat and bricked the phone, the phone can enter fastboot and recovery mode but I can't flash the stock firmware because it gives me the verification failed message when trying to flash the files, I have been reading lots of tutorials but I can't get any of them working, when trying the blank flash thing the CMD window just stays in the waiting for device message.
Any help would be appreciated, thanks in advance.
zeratos said:
Hello, a friend asked me for help unbricking his phone, apparently he downgraded to marshmallow, had some wifi troubles, tried to upgrade back to nougat and bricked the phone, the phone can enter fastboot and recovery mode but I can't flash the stock firmware because it gives me the verification failed message when trying to flash the files, I have been reading lots of tutorials but I can't get any of them working, when trying the blank flash thing the CMD window just stays in the waiting for device message.
Any help would be appreciated, thanks in advance.
Click to expand...
Click to collapse
If device is able to boot into bootloader, then blankflash will not work..
What is version of firmware you are trying ?
Currently this is latest firmware >> https://forum.xda-developers.com/moto-g4-plus/how-to/stock-rom-npjs25-93-14-4-march-1-t3608138
Validation or bad key id errors are ignorable, ignore them.
Just make sure you get OKAY at end of Command..
If you get any error, post cmd screenshot or copy test and pasre here..