SC-P600 firmware not updating

[SC-P600 firmware not updating]

So I got it working. Instead of following the tutorial on the website, I found a detailed tutorial that confirmed the update is suppose to fail! Duh, why not provide this tutorial to being with
Anyways. It works, I am happy. Good times!

[SC-P600 firmware not updating]

I am at the first stage of installing the firmware via EPFWUPD.exe. I have followed the instructions to the letter, but the update continuously fails. I have tried at least 10 times (probably more).

During the initial installation starts well, the printer reboots at 71% (ish) although it pretty much jobs straight up to 71%. After the reboot it reaches 85% and sloooowly works itself up to 99% before failing installation.

I have checked all the Epson processes have been closed, I also used WICReset to make sure, I am installing it in normal mode, it's connected via USB and detected. I also tried installing it as admin. I have rebooted PC and printer several times.

The thing is, this is the second key I have bought. First time it worked flawlessly , but I installed it via the WICReset (old method), however this does not work this time, the key don't exist... Point is, I know it works on this specific printer.

What just don't know what to do next or if there is anything else I can try.