I have tried it 3 times and it has worked everytime for me. I can't guarantee it for you and obviously it risks permanently bricking you phone. Obviously this is a suggestion and it will be you who bears the risk if it does not work!. I did as follows: "flasher -f -F main.bin --erase-user-data=secure -F emmc.bin --erase-mmc=secure" (no quotes) When this has started, you have 2 options: 1a - either CTRL+Z (Linux) or kill cmd.exe and flasher.exe with Task Manager (WIndows). 1b - Pull out the cable from the phone when the tasks have been killed or 2 - Just pull out the cable when the phone is zeroising. After this, turn the phone off and then on. You will get a message saying "Install an Authorised Operating System". Turn off the phone and run: ""flasher -F main.bin -F emmc.bin -f"" And the phone should accept it and start flashing. Like I have said, I have done it a few times and not noticed any issues (albeit theoretically it could damage the flash memory) but it may allow you to flash unsigned kernels.