Well, I did recently, and I don't want it to happen again. I hope there is a way to recover with fastboot mode since that was the only thing left after formatting everything. Not possible?

PS: Sailfish-reinstallation cost me 39€ which isn't too much, and it only took 2 days to get it back. Considering it went to Helsinki and back, that's quite fast. But I'd still like to handle my own fumbles myself