Specifications
RMU800A SERVICE MANUAL 
- 21 - 
Note: In User Set Mode, turn the power off and back on to enter the Conventional Mode. 
4. Firmware Download Mode 
The built-in FLASHROM enables user to add new functions simply by upgrading.   
(1)      Turn on the power while holding down [PF4] simultaneously to enter Firmware Download Mode, 
“PC Program” appears on the LCD. 
(2) Run the programming software. 
(3)      Connect the radio with a PC by programming cable. 
(4) Select the corresponding COM port, then click “Download”. 
(5) When data is successfully written into the radio, click “OK” to exit. 
(6)      Repeat step 1-5 to program another radio. 
Note: The radio can’t enter the Firmware Download Mode if it is prohibited by your dealer. 
It can be set ON only after being programmed through the programming software or by your dealer. 
Horn Alert 
27 
PF6Horn Alert  Horn alert
LCD BackLight 
28 
PF6 LCD Light  LCD backlight 
Scramble 
29 
PF6 Scramble  Scrambler 
Compander 
30 
PF6 Compande 
Compander 
AUX A 
31 
PF6 AUX A 
AUXA port output control 
AUX B 
32 
PF6 AUX B 
AUXB port output control 
Send GPS 
33 
PF6 Send GPS 
Send GPS   
Emergency Call 
34 
PF6Emergency 
Emergency call 
6  [PF6] 
Message
35 
PF6 Message
Message 
Volume Knob [Default] 
Volume Knob 
Volume knob 
Channel Knob 
Channel Knob 
Channel selector knob 
7 
[SELECTOR 
KNOB] 
Zone Knob 
Zone Knob 
Zone selector knob 
Volume Up/Down  Volume UpDn 
Volume knob 
Channel Up/Down [Default] Channel UpDn 
Channel selector knob 
8  [Up/Down] 
Zone Up/Down  Zone UpDn 
Zone selector knob 
9 
END END  END 
Display “END” indicating the end 
of menu option 










