fastboot flash oem_a *.tama.img ; fastboot flash oem_b *.tama.img
The TWRP installation thread is https://forum.xda-developers.com/t/...dp-xz2-c-p-3-twrp-3-4-0-0-unofficial.4074305/ but I'd recommend NOT to install TWRP.
You can run TWRP from memory:
- fastboot reboot bootloader
- fastboot --disable-verity --disable-verification flash vbmeta vbmeta.img
- fastboot boot twrp.img
If you install TWRP, you might get stuck when AOSP asks for a factory reset / user data wipe which it does once during the installation process. Somehow it seems you have to run the AOSP recovery's wipe process.
i decided to just run TWRP from memory if you I need it. For now.
Edited to add: There is no official TWRP build for the XZ2c. So you can't use the TWRP app or download anything other than MartinX3's TWRP builds. Or you can build your own TWRP. There's a thread on that as well: https://forum.xda-developers.com/t/dev-how-to-compile-twrp-touch-recovery.1943625/
Not sure if that's a good idea inless you're relly into computer science.