OK. I miss your point.
The problem is V5 Firmware structure has some difference from v3 by size and some structure. I do found the Block size. But can't extract it with cramfs.
v3 has mkv3update source code for building v3 and OI firmware.
Without info from JINKE, For v5, it can be modified for changing logo.
The method I said is only alternate way for v5 now.
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