Since the server pushes update notice to different serial numbers by batches, it may take some days for you to receive the FOTA notice. Thanks for your patience. You may tap “System updates” in [Settings] >[System] to check if there is new firmware available. Or, you can also try to manually update firmware by referring to the following link. How to update firmware on my phone?
【Release Note】 Updated Android security patch to 2022-02-05 Optimized the compatibility with Hearing Aids Fixed the problem of low playback volume when recording with wired headset Improved the stability of the Blink light function Optimized the stability of Wifi function