I cant get wifi on my kindle fire

If book is downloaded on the Kindle Device then do not need you the Wifi. If not THen you need the wifi to connect with the Kindle Server. Kindle Technical Support Registration 877 690 9305

Yes, Kindle is a name used for all the Amazon tablets and e-readers.

Kindle 2, 4, 5, 7, 8
Kindle DX
Kindle Touch
Kindle paperwhite (1,2,3 generation)
Kindle Voyage
Kindle Oasis
Kindle FIre 7
Kindle Fire HD 6, 7, 8, 8.9, 10
Kindle Fire HDX 7, 8.9

And I probably missed some in here.

micrasoft need wifi to setup internet

It has lost some of settings. So re-register the device.

enter a random pin 4 or 5 times. It will reset to Factor settings.
You will need to:
reconnect to wifi
reconnect to your Amazon account.
Re download any apps/games you want.

"Someone" is a person who uses your Fire - explain to everyone that if it happens again they will not get to play with it any more.

Enter a random pin 4 or 5 times. It will reset to Factor settings.
You will need to:
reconnect to wifi
reconnect to your Amazon account.
Re download any apps/games you want.

The Demo Kindle Fire Model Number 3HT7G is completely locked down. It is not possible to remove the Demo, reset the Kindle or Flash new Firmware using a Backup and Restore Utility like Kindle Fire First Aide. The Development Team of Kindle Fire First Aide is working on a procedure to reset these Kindles but the procedure will involve opening the Kindle which Voids the Warranty. Until we develop this procedure you are locked out. Sorry, I wish I had better news. Best regards, Chris Bryant - Prokennexusa at XDA Developers

what message do you get when you try to connect to the wi-fi?