TWRP 2.8.7 does not boot on the phone (black screen and reboot to Huawei logo) TWRP 3.0.2 does boot. Unfortunately I didn't think to take a backup of the system before I started this since I'd done it twice before without problems. Here's what I've tried to do to get this phone to boot again: Took TWRP backup of another ALE-L21 running B584 and
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