external webcam too dark topic

hi everybody, I need to use an external webcam on android device (android stick mk809III)

I use a logitech c270 (which I read is compatible as someone is using it), but the image is too dark (almost -2EV)

is there a way to tweak the signal in order to achieve this lost exposure in every app like camera and skype?

I tried on my samsung galaxy s5 and is correctly working...

thanks

Mk809iii and webcam logitech dark topic

Hi everybody
I have an android stick mk809iii and I want to use it with skype
I have a webcam logitech c270 which I have heard is fully compatible with such devices, but I found out that the the image is too dark, almost -2 stop exposure

In the camera app I can increase sensitivity in order to see the image, but in skype I can't.... Is there any tweak to solve this problem?