Retevis CPS V1.4.2 Changelog: 
1.Channel name length changed from 14 bytes to 12 bytes, provide display space for zone name. 
2.Added TX power setting for Analog APRS.
3.Added a Mute on/off option for channels.
4.Added a Scan LED Indicator on/off option under Basic Settings.
5.Added new firmware notification: a prompt appears when the firmware version is lower than version 1.0.06.
6.Fixed the power-on logo (boot image) upload problem.
7.GNSS: added unit selection for distance, altitude, and speed.