android unpack the rom tool. The which split_updata.pl is a perl script, you can unlock the update.app, unyaffs.c and unyaffs.h compiled binary file can unpack the unyaffs format system.img. There a unyaffs binaries is x86linux under.

source\split_updata.pl
......\unyaffs
......\unyaffs.c
......\unyaffs.h
source

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