Using file command we can get some information from the firmware binary files:
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file REMOTE_PACKAGE_2_30.bin
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file TS-S402_FW_2_00_13.bin
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Or not
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Let's using binwalk - our best friend
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binwalk TS-S402_FW_2_00_13.bin
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We can observe a lot of LZMA data, however, we got an interesting gzip compressed file as well. From this point, we can use the -x option to ignore LZMA compression and extract only the gzip file. Something like this:
binwalk -ex lzma TS-S402_FW_2_00_13.bin
-e: extraction option
-x: ignore option
Accessing the _TS-S402-FW... folder, we can observe two files:
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file 20
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20: POSIX tar archive (GNU)
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Ok, 20 file is another compressed file. Let's renaming it and unarchiving it.
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mv 20 20.tar
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tar -xvf 20.tar
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Yeah dude, it was a strong journey!
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Mount the filesystem
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mkdir sqsh
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sudo mount rootfs.armeb.squashfs ./sqsh/ -t squash fs -o loop
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If you got an error, don't worry about that!
If we look at the hexadecimal, we can see the file format: