ViewSonic VS15197 Service Manual page 127

Check the Scaler firmware version
1. Power on the set and enter into the Android system.
2. Press the power button to enter into sleep mode.
The LED indicator becomes amber color.
3. Press Menu and then power button to wake up the set.
The LED indicator becomes purple color.
(If you are in the Android lock screen, please unlock first.)
And press Menu button again.
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VSD241/SD-A245/CDS245