You might get more information by using the dmesg command after a mount attempt Unable to mount cifs share via command line, for example Do you have an /etc.
how-to-fix-cannot-restore-system-mounted-read-only-in-twrp-1 - Hovatek Blog
Check for file system errors
Run the fsck command to check for errors in the file system and fix them
You can use the following command Internal hdd mounted as read only [solved] forum rules before you post read how to get help Topics in this forum are automatically closed 6 months after creation.