Originally Posted by LiberOz
i'm using 757 version but when i want to install the new firmware or other in twrp i'm getting "E: unable to mount/system" error. then in mount option i can't tick system. how i correct this problem?
You should wipe all that's possible (factory reset etc.) and do new install. Backup before! Downgrade to other firmware like .257 and then root.
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