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I managed to unpack the filesystem contents of a TP-Link router .bin file using binwalk, dd and unsquashfs. The squash FS was at the end of the bin file, the part before having a relatively large lzma archive.

Now I would like to make changes to the filesystem and repack the firmware file back. How can I achieve this? How do I know whether I need to attach a checksum or similar?

This question is different from How can I put a Binwalk extracted firmware back into a .bin binary file? in that it's vendor specific, firmware-mod-kit is a not preferred option (unless it's the only one...) and it contains an extra question

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  • "a TP-Link router" is not being very specific for a supposedly device-specific question. In general terms, read up on how to pack a squashfs (don't forget that the permissions need to come out right). As for a checksum, you could try without and see what happens. Hopefully you've done a flash dump before starting. Sometimes physically replacing the chip is worth the few minutes it takes. Oct 21 '19 at 6:32
  • @ChrisStratton flash dump is for in case I mess up or what? I don't have a second chip to it with in the first place apparently. Oct 21 '19 at 16:42

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