MARTECH RCD PRO 6.5.3 Algorithm for reading code from car / navi RNS315
Initial options : unit must have 3 code tries left
Remove the radio metal shields and CD drive
Desolder EEPROM 95256 from mainboard
With SPI_Tool Clip Portable Application version 1.2 make backup and set full memory protect – function “Protect EEPROM Area”. Note, that SPI Tools work without Expander module!
Use “Read Status Register” for sure, that EEPROM has protected whole memory area.
Solder protected EEPROM on board with crossed WP signal (3pin of Eeprom) to GND (4pin of EEPROM)
Connect the Expander signals from the radio plate according to the diagram to the radio / navigation
Assemble the radio in a way that ensures the proper functioning of the device. Turn it on, previously connect 12V power supply to the radio.