Newer Honda Accord instrument cluster has secured processor spansion mcu S6J3001. There is also a RH66 chip but the km data is not stored in it.
CG100 Prog iii is the cheapest programmer to read/write chip S6J3001. Not directly calculate mileage. YRead S6j data, send data to CG engineer to modify data, write back new data to S6J.
Here is the instruction on S6J3001 mileage correction with cg100.
Select Instrument function->Asian cars->Honda->Accord->S6J3001 Read/Write
CG100 will show you wiring diagram
Connect CG100, and cluster with BDM4 adapter follow the diagram
Original mileage: 8,0888km
Read and save eeprom data
Send the eeprom data to CG engineer to modify mileage data, i.e 2,6666km
Write the modified data to S6J3001 chip.
Here is the another example of Honda Civic s6j336a mileage correction http://blog.obdii365.com/2023/04/04/2022-honda-civic-s6j336a-mileage-correction-by-cg100/
