did you tried hard resetting your MediaPad s7-701u or you have just formatted normally from menu ? if you didn't tried hardreset then follow the steps.
- Press and Hold POWER BUTTON + VOLUME UP +VOLUME DOWN
- When vibrate the tablet release Power Button.
- You see ANDROID image then RELEASE Volume Up
- you will see the android image with running lines
Still Hold Volume Down then waiting
After few second screen show up OK and your Done now! release vol down now
Be patient when rebooting it takes 5-10 minutes
Good Luck.
Br
Babar Abbasi