The phone was originally delivered with (according to the BM818 tool):
M100E_YCSN0_1.0.0_210830
YCSN0_M100E_1CMD_B227_V1.0.0.1_20210907
M100E_1.0.4_200715
After the firmware update, it is now
M100E_YCSN0_1.0.0_220926
YCSN0_M100E_1CMD_B227_V1.0.0.2_20220930
M100E_1.0.4_200715
Firmware needed a couple manual power offs and restarts to kick in.