I just got my librem mini in the mail. I ordered without ram or hd. I installed my nvme drive and some ram, and ran the coreboot_util.sh script. but I still seem to have seabios at boot. I also checked out the purism-heads branch but dont see librem-mini in the configs dir.
Support for flashing PureBoot on the Mini via the coreboot utility script will be added with the beta-13 release, which should be out in the next day or so. The reason it’s not available now is that the initial Mini Pureboot build was done from a different codebase and it took me a bit more work than anticipated to merge them. Also, lots of fixes and improvements in the update for all Librems. Stay tuned!