I don’t think there is anything out for the OLED yet, you will have to wait for someone to unlock the BIOS

I have Windows 10 installed on a micro sd card which I booted into and flashed the bios through there. There is a video on Youtube that explains the process. Here it is
https://www.youtube.com/watch?v=7x8YZuXVAQ8

Perhaps there is a beta of powertools that will resolve the problem?