Regenbunt If you are getting a message saying your phone is corrupt, flashing did NOT go OK and you should NOT lock the boot loader.
The description of steps you followed is unclear. Using an unsupported browser or OS can result in random parts of the process working and random parts failing, which could brick your device. It is important to follow all directions carefully and to stop and ask for help at the first sign of trouble (don't press on hoping it will work out OK).
Can you describe in more detail what steps were taken, what happened, and what your phone displays as it boots?