Android One Stuck in "Checking Connection" after Factory Reset
This happened to one of my friend some time ago. But his device and android version were different
Why you're trying to connect to any connection? Just remove the sim card and skip the "Connect to a Network" step. It will give you a prompt, select the `SKIP ANYWAY` option and you're good to go !. Later you can insert your sim card and connect to your favourite WiFi network and sign in to your accounts and whatever!. Just skip everything until you get to the homescreen. 

 This is the easiest method. Good Luck! Tell me what result you get.