Darth is right. I have tried it many times (after flashing back to drv777). I've used Android. And after I have send the code several times, it has changed. After I have changed the serial to C (25kmh) I was able to flash cfw (without touching the top speed value) and all changes were accepted. Grea...

Hello My scooter is a Max G30D, with the official 1.2.6 Update. I´ve successfull changed the Serial Number and was able to flash CFW´s. So, many thanks to the Team of scooterhacking.org. The way to the CFW´s was: flashing Dash with BLE555 -> DRV777 -> change Seriel with the "magic serial" -> DRV126 ...