DWL-900AP+/800AP+/810+ firmware checksum calculator

Firmware Modification Instructions

• Unarj some_firmware.bin (is actually an arj archive)
• Modify NML.MEM image
• Arj NML.MEM back to some_firmware.bin
• Pad zeros to end of some_firmware.bin until it reaches size 0xe0000
• Copy hardware version string starting at address 0xdffe0
• Compile dwl_checksum.c:
  • gcc -o dwl_checksum dwl_checksum.c
• Calculate 32bit checksum:
  • dwl_checksum < some_firmware.bin
• Copy 32bit checksum (lsbyte to msbyte) at address 0xdfffc

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Download

C:dwl_checksum.c