Firmware update 448 failed

I tried to update my firmware fron 444 beta to 448 regular.
Before that I updated roastime for windows successfully…
Now the firmware update does not get started. It remains on 0% updated. I can cancel the update and firmware 444 is still on the machine.
Any suggestions?

I had to go back to the old RoastTime 1 to update my firmware when the exact same thing happened.

Thanks. Just mailed the log. Still can’t update. Back to the old version does not work, the Bullet does not connect to the old version anymore.