Guidelines for factory resetting gateways or accessing the CLI during provisioning has changed quite a bit over the last few months. On a factory default gateway, you can log into the CLI with the following
If presented with the activate wizard, type: intdbg
If you have a username/password:
Username : branchsupport
Password: <mac address in lowercase with colons>
Factory Reset a Gateway
Easiest way if you have physical access is to hold down the reset button for 15 seconds
Unless its a model with no button. Last resort is to just format the boot partition via cpboot
format 0:2
Although, if you’re down this far the rabbit hole, I would contact TAC or an SE at this point.
References