FYI I bought an "SD49225T-Hn" from amazon last year and it came with this firmware:
System Version V2.800.001W000.0.R.P9.2520.UN.NR, Build Date: 2020-05-06
WEB Version V3.2.1.872191
ONVIF Version 18.12(V2.4.5.826858)
PTZ Version V2.401.0000000.64.RHNZ_200219_34642
S/N 6K07070PAJ5CB99
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