The problem mounting the V5 ro.fs and root.fs is the cramfs format used by Jinke. The first modification to cramfs standard is the offset size, changed to 32 bits, so the i-node length is 16 bytes (and 12 in standard). A modified version of fsck.cramfs is needed to decompress the files in these images.
If you are interested I can show you the code and another "special" structure included in root.fs (but not in ro.fs).
Regards
QB
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