unable to access internet with ipad 6.1.2

Hello everybody,

For the past two weeks I have not been able to connect to the internet using the ipad model MD511X/A (retina display) 6.1.2; it still has 23.8GB available space and was bought 4 or 5 months ago.

Already tried the various troubleshooting steps suggested on support.apple.com (including: turn off and on wi fi, turn off and on ipad, deleting network and joining from zero, resetting network settings...) I think it all started when it asked me to update the version, one day it would simply not connect to the internet anymore.

Thank you in advance