For serious work, always keep an original firmware dump and a JTAG recovery method. Humax boxes are robust, but a bad flash can brick them completely. Would you like a focused guide on a specific model (e.g., HDR-FOX T2, Foxsat HDR, or Aura), or help extracting a particular .hdf file you have?
scripts/extract-ikconfig kernel > config.txt U-Boot often unlocked via UART. Interrupt autoboot with Ctrl+C or Space . Commands: humax firmware
binwalk -X firmware.hdf Then decrypt:
dd if=firmware.hdf of=kernel.lzma bs=1M skip=1 count=3 lzma -d kernel.lzma file kernel Check kernel config: For serious work, always keep an original firmware