Settings - About Devices - Firmware Version
continue clicking 'Firmware Version' 8 times.
2. Going to hardware testing page and choose First PCBA
3. Scrolling all the way down to choose sub-screen testing, which I've already circled it in the below picture (Sorry about it is Chinese, our developer is still working on it).
Test 1: multi-points touch testing
Test 2: draw a line in the area
4. After clicking Test 1 or Test 2, please testing on the sub screen. Meanwhile, please take video and send results back to us. We really appreciate it