I think I got it. The adobe file wasnŽt composed with a very large file: the adobe file is bigger than 32 Mb and the size in i-node is only 24 bits. The solution is used the "data block too large" as a flag of a >32MB file.
IŽve just try to decompress the image, add a file, recompress (with mkcram_32M) and pack it AND works... The firmware load and boot normally.
IŽd published a new version of tools (including the decompressor) in this link
The unpack_v5 extracts files from image, decompress ro.fs.v5 and root.fs.v5 files in rofs.v5 and rootfs.v5 directories.
The pack_v5 compress rofs.v5 and root.fs.v5 directories in ro.fs.v5 and root.fs.v5, and creates the v5setup.bin file.
I hope youŽll find useful.