Before downloading any firmware—repacked or official—you must identify your router’s hardware version. Installing the wrong version will brick your device.
Crucial Note: Firmware for v1.0 is not compatible with v5.0. Downloading the wrong one is irreversible.
First extract kernel from original:
dd if=original.bin of=kernel.bin bs=1 skip=32 count=262112 # length = offset-32
Combine kernel + new rootfs:
cat kernel.bin new-rootfs.squashfs > combined.bin
Wrap with TRX header:
trx -o repacked.bin combined.bin -m 0x0 -f 0x1
(-m 0x0 = no magic offset, -f = force)
Type "F6" into the product search box. Select "F6 300M Wireless N Router" from the dropdown. tenda f6 firmware update download repack
If web UI is inaccessible but U-Boot works: