How to Root Prestigio 7.0 ultra+ (PMT3677)

As a surprise for myself, rooting this particular tablet, was not that hard and I finally managed to get rid of all the programs that were eating all my tablets resources. These are the instructions as it worked for me:

How to Install Firmware on Prestigio PMT3677 tablet

  I bought this tablet (Prestigio 7.0 ultra+ PMT3677) quite cheaply, so i expected some problems with it. After a short period of use it became apparent that it's horribly slow. Especially due to the fact that, like many android systems, every program wants its share of tablets resources (which are already low) and because they are preinstalled its impossible to remove them without rooting your phone.
  So one other option includes resetting tablet to factory preset and/or reinstalling the whole firmware.
  I will give the instructions as it worked for me.