As you know, TWRP still doesn't support FBE, so in-case if you wanna flash another system.img the Wipe data/factory reset in TWRP wouldn't work (at least didn't work for me).
That would force you to get back to stock recovery, which allows a su...
If you wanna backup your old recovery, if in-case anything goes wrong, just follow these steps.
1)Root your device with Magisk
2)In a local terminal app or in adb shell, type su and get a root shell.
3)Do dd if=/dev/block/bootdevice/by-name/recov...
Removed encryption by modifying fstab, now this recovery is working flawlessly on all custom ROMs including stock.
i have a question, if i flash twrp, huawei erecovery could be disappear？
Nope it won't. eRecovery is in a seperate partition, so even if you flash ramdisk, it won't get replaced. But the ordinary recovery would.
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Does this have fingerprint based navigation just as in EMUI, so that we could disable the onscreen navigation bar?