I've gotten my phone off the old "end of line" firmware onto the EU firmware - EVA-L90C432B391, Android 7. It's just doing app installation and an over the air firmware update now.

I used the free beta version of the DC Unlocker tool. It's 20 Euro once it's out of beta, so if you want to use it, now is good. It wasn't quite smooth sailing, it boot looped for a while and I had to mess with it a bit to get it going. All in all not too difficult though. The trick is if it says there's an error hit the button to continue, make sure it's still plugged into computer, and run the tool again to update the firmware.

Update - the firmware actually came up to EVA-L09C432B395. Android 7, EMUI 5.0.1. Seems a bit faster than Android 6.