I've painted the cam black. The dual lens is handy to me since I can check two sides of the house now.
As far as the firmware is concerned: I'm on "V2.840.15OG004.0.R, Build Date: 2021-10-27" (IPC-HDBW5441F-AS-E2 Dual Lens Smart IR FW.), but I have a problem getting the motion detection to work...