Lool :D according to me, the newer coreboot is designed primary for new APU4 and APU5 board etc, so is possible to get errors when you upgrade lastest coreboot release on older APU2 board. Anyway this kind of problem is only pcengines busines and not deal anything with pfsense software. So better call pcengines staff and notice to her this kind of issue. Open thread like this on pcengines forum will be better choice to figure it out. Goodbye

You should ask pc-engines directly about your concerns with the temperature. They are usually very swift in replying.