This instruction show you guide on how to solve Mercedes Benz SOUND 5 HA1111 radio “PROD” error.If your radio get this error,it always just run about 15 second,then radio show you with the “PROD” error.
Remove SOUND 5 HA1111 radio on vehicle
Disassemble the radio to remove PCB
Locate 24C256B eprom
Here in 24C256B eprom is PROD,you just need to remove the eprom to get PROD OFF.
The radio can work normally even without this eeprom.
Remove 24C256B from PCB
And now we can test radio
Power on the radio,and the PROD error disappear,it can work correctly.