With the radio off, long-press the DISPLAY/TEMP button to switch between Celsius and Fahrenheit.
This is the biggest win. Early D-808s had terrible BFO (Beat Frequency Oscillator) drift. The 8832 firmware implements a temperature compensation algorithm. After a 10-minute warmup, SSB holds steady for 30+ minutes. xhdata d-808 firmware update
18;write_to_target_document1b;_zFvtaeb8JZf9kPIPu8-C4A8_100;57; 0;996;0;61d; 0;26c;0;7f3; With the radio off, long-press the DISPLAY/TEMP button