Greetings!
Can someone advice if this one is compatible with The_Only_Trusted_OpenWrt? I was unable to find an answer even though I was looking on hungarian websites!
Not supported by OpenWrt -- hardware information page.
EDIT: I linked to the DIR-825, which appears to be an 802.11n device. There is no listing of the DIR-825ACG1 in the TOH which means that it is not supported by any official OpenWrt build.