GX-BT3 (serv.man4). Reference - Sharp Audio Service Manual (repair manual). Page 7

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GX-BT7
2
 – 1
CHAPTER 2. ADJUSTMENTS
[1] Version Check 
1.Version checking method
2. Software version display
Since this model has no FL display, LED is used to indicate software version by light up or no. of blinks.
1. During Audio In function, press         button (remote control) then press and hold         button (remote control) until 
 LEDs light up to indicate software version.
Example for software version display:
Version
v003
v099
v102
v115
OFF
OFF
ON
ON
X
9
X
1
3
9
2
5
Running LEDs
No. of Blinks (2Hz)
USB_LED
(orange)
PAIRING_LED
(blue)
3. Exiting Version Check
   3.1. While in Version display, press ON / STAND-BY button (remote/main unit). Micom is reset then 
           go to Bluetooth Stand-by Mode.
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