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According to the developers there are about 450 devices supported by TWRP. == TWRP 3.3.0+ Ramdisk Install ==With the release of version 3.3 are some new features. One important change is better support for new Android devices with A/B partitions. Currently, installing TWRP on a device with A/B partitions requires booting TWRP temporarily and then installing it permanently using an installer script. Going forward, users will be presented with a new “install recovery ramdisk” option in recovery. * TWRP can use /data/cache/recovery and /persist/cache/recovery on AB devices with no cache partition (bigbiff) === A/B Partition Devices ===With version 3.3.x on an A/B partition device you will see an "install recovery ramdisk" option when booting TWRP that doesn't require a separate installer script. The official TWRP installer ZIP by default installs to both boot_a and boot_b. == Un-Brick device ==Option boot into EDL mode is Emergency Download (EDL) mode.