I am unable to change parent code

I have bought a used LeapPad Platinum and don't know about the parent lock code. I am trying to reset by trying different approaches like 196Backspace87 296Backspace87 etc but couldn't fix the problem.

I have tried to turn on the device by pressing the power and volume up buttons together but this one also not working, it simply turns on the device and turns off, not opening any reboot/factory window.