Fairphone 3

Install TWRP Boot manager

• Zet twrp.img op sdcard van de telefoon
• Sluit telefoon aan en enable debugging

adb devices
adb reboot bootloader (na dit commando gewoon doorklikken bij 30s melding)
fastboot boot twrp.img

• Once booted, navigate to the Advanced > Install Recovery Ramdisk option.
• You also need to use the "Fix Recovery Bootloop" option present in the same Advanced Tab.

https://twrp.me/fairphone/fairphone3.html