Hi10 Air Not Powering On

I flashed the 1903 bios. I saw this post as the 1903 can be applied for 1810.

After I flashed and verify. I disconnect the SOI clip and reconnect the battery. Still no sign of life.
Then, I charge the tablet and the voltage and ampere appeared like in the video. In the video, there is
a noise sound where I put the microphone. Need to put on headphone/earphone to hear properly.