Galletto 1260 ECU flasher read/write BMW MS43/MS42

Is it possible to read/write BMW MS43/MS42 with Galletto 1260 clone ECU tuning cable? Here is the little tutorial which our customer shared.

Read and write BMW E46 MS43 ECU for Euro 2 software:

First of all, get a Galletto 1260 cable clone with the extra adapter



Here is a close-up of the 2 connectors. The white 2 pin connector has “L” and “K” pin identifiers and the black 2 pin connector, “+” and “-” which should be power and ground.


How to use the Galletto v1260 ECU flasher to read/write full flash from MS43/MS42?

  1. First, you need to remove ECU from car.
  2. Turn off 4 torx bolts from case and extract mainboad.


  1. Locate 104 boot pin


4.Short boot pin to GND

5.Put “+12V” and “-” to your black (2 pins) socket connected to Galletto cable


6.Connect K-line from white (2pins) socket to ECU


7.Connect power to ECU


Note: If you use the K-line pin.

1) L-line no need

2) 12V and GND is direct power source to black (2pin) and to ECU (4/7 and 26)

After 6 Seconds (from power connected) remove wire between 104pin and GND.

That’s all. ECU now in bootmode and you can “connect”

Test result:

Successfully read and write MS42/MS43 full flash in bootmode with Galletto v1260 clone and JMGerageFlasher software.