To reset contrast on the sunnuto t3d hold down all 4 corner buttons at once, this will place the watch in sleep mode. Wait a few seconds and press any button to wake the watch back up. This will allow you to run through the inital set up just like when you got your watch, alot of your info will be saved so you can just quickly confirm them with the mode button. I also set my contrast too high, I have reset it to 3 and found it much easier to read in all lighting.
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