I think I was on whatever is the latest FPOS as of today, since this guide says in order to get the OEM unlock code, the software had to be updated. I didn’t want to update because I’ve heard it causes issues, but I couldn’t get the OEM unlock code until I updated…
As for the CalyxOS version, I’m not really sure where I would see that… I just flashed whatever was on this page (actual download link here).
Thanks for the quick reply! Is it really that hopeless?