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You are a genius!! same problem with error 7 .. cepheus??Mi 9??Ok, Ive checked and have a ROM installed
After you have unlocked bootloader and install this TWRP you must do a factory restest, so means you lost all your data or try to install form extermall memory.
In both cases you will get ERROR 7 - what to do?
Simple, decompress ROM, Go to META .. com goole and using NOTEPAD++ delete first line of update script file, then save file, compress ROM to ZIP and BINGO
I tried to backup system data with the mauronofrio's twrp, however the phone stuck at "just wait for a second.." after reboot.Thanks, I use this (twrp-3.2.3-10-cepheus-mauronofrio.img), but backup and other features don't work ...
I also found this one: https://androidfilehost.com/?fid=1395089523397922097 if you want to try ...