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Posts: 803 | Thanked: 1,585 times | Joined on Aug 2014
#2
This is a good reference: https://translate.googleusercontent....M_Cta_FcegEIzQ

Carried this procedure out successfully upon F5121 only a few days ago but needed Androxyde Flashtool to force change between flash mode and fast boot mode:http://www.flashtool.net/changelog.php

I downgraded from Nougat to Marshmallow (Commercial & Journalists) Flashed TWRP and then in TWRP recovery:
HTML Code:
adb shell dd if=/data/local/tmp/TAbackup.img of=/dev/block/bootdevice/by-name/TA
after which flash stock firmware. I did need to hard reset F5121 by holding down Volume (up/down) + Power until get three vibrations then release at times when device unresponsive. I made mistake of not flashing new enough firmware, so had to go through a lot of Oreo OTA updates.

Details of how to obtain firmware are in Part (1) or (2) of first quoted resource. Let us know how you get on or any problems you run into.

Please note that prior requisite is that Fastboot and ADB are functioning correctly whatever platform you are using presumably Linux machine?

You should get these values after restoration of TA_Backup:Name:  Backup_TA.jpg
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Last edited by aspergerguy; 2018-10-04 at 15:14. Reason: Addition
 

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