Just a ‘heads up’ for all of you – flashing BIOS may cause harm!
Backstory: Laptop came with Win8.1 Installed Win10 and used Win8.1 key to upgrade to Win10Pro. Win10 Anniversary did not install well . . . any of the 3 times I tried.
Fix: HP offered BIOS update which I did. Then I installed a new SS hard drive. Next – installed Win10 ISO file and updated to Anniversary . . then updated to Creators edition.
Unfortunately, somewhere in the process, Microsoft decided to lose or ignore the ‘key’ for Win8.1 . . . . so I have the Home edition and can’t upgrade to Pro by entering the activation code for Win8.1 I used Belarc Advisor – on both my machines – and on the desktop my ‘key’ for Win7Pro is there along with a new activation code for Win10Pro-Creators. On the laptop, the Win8.1 ‘key’ is gone and trying to change/insert the activation code does not work.
So was it the flashing or missing a key step in some process — I don’t know — but I’m NOT going to undo/redo or lose sleep. Win10Home will do for the laptop.