Best V2 firmware for Android app v 2.22.21

Cameras
1

Hi,

Highest version app I can load on my device is version 2.22.21. What is the best firmware to install onto V2 cams for this app version?

Thanks,
John

2

Whatever is the latest version. My non-RTSP V2 cameras have 4.9.7.798 - that could be a beta version.