What it is
FMB, FMC and FMM are Teltonika model families that share a firmware base and therefore a command set: FMB001, FMB003, FMB120, FMB125, FMB130, FMB140, FMB204, FMB209, FMB920, FMB930, FMC130 and FMM130 all take the same setparam string.
What changes between them is the hardware around the modem — OBD plug versus wired harness, 2G versus LTE, ingress protection, CAN interfaces, internal battery size. The way you point one at a server does not change.
Be careful with what we are claiming here: we have tested the FMB920 and the FMB930 on our own vehicles. The others are the same firmware family and the same documented parameter numbers, but we have not put every one of them on a bench. If yours is on that list and behaves differently, tell us and we will correct this page.