T54 no sub snapshot

[dahi12]

I am trying to get an jpg snapshot from substream1 with vga but no luck.
admin:[email protected]/cgi-bin/snapshot.cgi?channel=1&subtype=1 gives always full resolution
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T54IR-ZE-S3
System Version
V3.142.0000000.8.R, Build Date: 2025-08-26