The firmware revision from my newly installed BM818-A1 card (that I recently purchased because I was experiencing unsolvable SMS/MMS problems, and which solved my problems) is:
firmware revision: MPSS.J0.2.0.2.c1.1-0032-9607_GENNS_PACK-1.351938.1 1 [Nov 26 2020 02:00:00]