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The Mod

So what does the firmware modification actually do?

It patches out two if() checks that prevent SA-30 and SF-210 from working.

That's it. There's no magic, no extra code, no extensive work.

The LS-50 firmware is in reality just a trimmed-down version of LS-5000 firmware. The work done is so sloppy that there is still a string LS-5000 present in the LS-50 firmware.

Remove the checks - and suddenly the scanner accepts the SA-30 happily. It knows what it is, it knows how it works - it even knows its name if you delve into the strings section of the firmware.

For posterity, the relevant checks to patch out are:

LS-50 1.02:

  • 0x2A219 - replace 0x05 with 0x42 to restore support for SA-30
  • 0x2A21F - replace 0x06 with 0x42 to restore support for SF-210

LS-40 1.20:

  • 0x29EB9 - replace 0x05 with 0x42 to restore support for SA-30
  • 0x29EBF - replace 0x06 with 0x42 to restore support for SF-210

Offsets are from the start of the FLASH, not from the start of the update file - for that, subtract 0x10000.