![]() After the device is in fastboot mode, run: fastboot flashall -w. To flash a device: Place the device in fastboot mode by holding the appropriate key combination at boot or using the following command: adb reboot bootloader. Since kernel is same for a device (other than build configurations), so only ramdisk needs to be replaced. Flashing also erases all user data, similarly to fastboot oem unlock. So the ramdisk.cpio in boot.img is that of recovery. On A/B devices, no ramdisk is required for normal boot because system.img is mounted as rootfs when processing Device Tree ( dtb) which is appended to kernel image usually. Traditionally boot.img and recovery.img had two major components kernel and ramdisk. Use magiskboot to allow repacking boot images for installing TWRP Now the official TWRP release includes the option Install Recovery Ramdisk: On TWRP this has been previously achieved by flashing a special ZIP file, or one could do manually. ![]() Then repack and flash boot.imgs back to device. But to permanently flash recovery to device which can be booted into by proper key combination, you need to unpack both of your boot.imgs (A/B) from device and replace the ramdisk with the one extracted from twrp.img. You can only boot in recovery mode with fastboot boot twrp.img. Devices with A/B partition scheme don't have a recovery partition. ![]()
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January 2023
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