Repacking the firmware can be risky and may potentially brick your router if done incorrectly. Proceed with caution and only attempt to repack the firmware if you're comfortable with the process and have a good understanding of the risks involved.
Inside, you may find:
DECIMAL HEX DESCRIPTION 0 0x0 TRX firmware header, size 32B 32 0x20 uImage header, image name: "Linux Kernel" ... ... ... 262144 0x40000 SquashFS filesystem, big endian tenda f6 firmware update download repack