Fastboot does not work + Android 6 upgrade issues

So finally I have a phone running Android 6.

I followed the link I mentioned before. Only the sideload did not work so I used fastboot mode flash method instead:

  • downloaded fp2-sibon-17.09.3-ota-userdebug.zip (on the phone)

  • downloaded fp2-sibon-17.04.0-manual-userdebug.zip (on the laptop)

  • downloaded fp2-sibon-17.09.3-manual-userdebug.zip (on the laptop)

  • unzip the …manual …zips

  • !!! backup backup backup !!! -> I used oandbackup for Apps+Data and TWRP Backup in addition

  • flash fp2-sibon-17.09.3-ota-userdebug.zip via TWRP --> run into freeze reboot bug

  • started the FP2 in Fastboot-Mode (Power-On + Vol-Down)

  • run the ./flash.sh in the unzipped (17.04.0 manual) folder *

  • rebooted phone (Android 5.1, stuck in boot-loop, optimizing apps)

  • switched off by pulling out the battery

  • started the FP2 in Fastboot-Mode (Power-On + Vol-Down)

  • run the ./flash-for-unix.sh in the unzipped (17.09.3 manual) folder *

  • rebooted

  • phone started “normal” with Android 6 (but the apps lost the data)

  • prepare oandbackup again and don’t forget to setup busybox correctly

  • restore all the app data you need one by one

*flashing the manual-userdebug.zips via flash.sh script also means the related TWRP recovery will be flashed. As the device was encrypted I had to re-flash the latest twrp via fastboot like shown some posts before (otherwise decrypt is not possible). You can also edit the flash.sh script before executing it to exclude recovery flash.

A very long and annoying procedure. Hope the next major release upgrade will be more smooth.

4 Likes