Vader 4 Pro factory reset issue

Got my controller 3 days ago. At first, it was working pretty fine then I noticed yesterday and today that after playing some games using the wireless dongle, my controller connects and disconnects repeatedly on my pc. I tried every solution that I can find but it still occurs. I tried to factory reset the controller by pressing O(fn) + home button then the white signal light started to blink faster than normal. I tried flipping the switch at the back to other modes but every time I turn it to dongle mode it just blinks, now I cant use it with the wireless dongle anymore. It connects to my phone via bluetooth and wired but not with the wireless dongle. Anyone who knows how to make it back to normal?