SNMP v3 in 3.30 and 3.25

Hello,
I have a problem with snmp not working correctly in router os 3.30 and 3.25. I am using v3 of that protocol and connecting to it with dude 3.5.
On other wersions of the router os that works correctwli in 4.5 and 3.10 others i didn’t try.
Marcin