Verification Failed

[luc-github]

If you have verification failed there are likely 3 possibles reasons:
1 - you left jumper in position erase => remove it and retry
2 - you have USB communication problem, which means your upload was not correct or it is false error
you can disable verification step in preferences but I suggest you to change usb cable / port and retry - you should not have any error if communication is correct.
3 - You are using VM to flash your printer, people using VM reported issue when using VM which was solved using native system. => use your native system to flash

This is not related to FW itself but your installation / hardware (previous FW is no more present and new FW is not yet active)