LineageOS 14.1 installed, TWRP 3.0.0 installed, phone working properly. After an OTA update gone wrong, the phone did not boot into system but only into TWRP recovery.

Based on https://www.reddit.com/r/LineageOS/comments/5riech/how_fix_twrp_recovery_boot_loop_after_lineageos/ the first try was to install a newer version of TWRP. This resulted in the phone unable to boot at all.

1. Boot into fastboot (VOL+ and Power)
2. Flash TWRP 3.0.0

3. fastboot erase recovery
   fastboot flash recovery twrp-3.0.0-0-crackling.img

TWRP 3.0.0 available again

Flash most current version of LineageOS –> no change

https://www.reddit.com/r/LineageOS/comments/5riech/how_fix_twrp_recovery_boot_loop_after_lineageos/

1. Boot into fastboot
2. Start normal system from bootloader

   fastboot continue

3. Enable ADB and root for ADB
4. Fix boot code

   adb shell
   dd if=/dev/zero of=/dev/block/platform/soc.0/7824900.sdhci/by-name/misc bs=32 count=1