Since my H810 isn't my daily driver any more and after following this thread for a looong time I decided to take the plung and unlock. Salt said "Some parts of UsU couldn't be flashed!" and continued but when that was done I was unable to boot into fastboot mode. From there things mostly failed. I do have a full salt backup from a few days ago. Right now the phone won't boot into either download or fastboot mode. Happy be be a guinea pig. Logs below:
https://bpaste.net/show/6028668ee3a1
Have you been usuing the post USU method of entering fastboot? ie:
Fastboot
After you unlocked your device with this method you will also have an unlocked fastboot mode which can be accessed by a key combo:
take out the battery
unplug the usb cable from the PC (not from the device)
Insert the battery again
wait 2 sec
press volume DOWN and while keeping it pressed: plug the USB cable to the PC
keep volume DOWN pressed until you see the fastboot screen
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