How to upgrade MiJia 4K Mini Action Camera Firmware? Simple, just use Mi Home application to do so. Done. Well, that’s for official stable firmware. You need to use the manual method to upgrade / download MiJia 4K Mini Camera beta firmware. Lot of interested features are available first on beta firmware like 2.5K/60, 1080P/120 and 720p/240 resolutions. 100Mbps highest video bitrate support. Want to try them too? Read on then…