Bringing an APX 120 to life and am an absolute beginner in the technical side of connectivty field. I own an XGS 107 firewall.

In general: It does not matter in the long run. Both products (SFOS/XGS and Central) do not require a license. So it is up to you, which product you want to use for management. I prefer Central Wireless. 

But an APX can be only managed by one product and the first product in the chain of communication will pick up the access point. Therefore you have to disable Wireless protection on the Firewall (SFOS) to get it running in Central. 

+1. I was skeptical of running the AP from the cloud, but it is nice and adds a couple of additional capabilities over what the XGS can configure. It also looks like future improvements will take place there and XGS control over APs will be second-class.

Thanks for your support, dear Wayne, you're not the first to recommend Sophos Central over the Sophos local machine, and it makes sense.

Kind Regards, Michael.

Dear, oh dear, this ain't working out. Tried q reset by using a pin-clip, then checked my router, found the Sophos APX 120, went online and deactivated the XGS107 local wireless application. Then, on Sophos Central and used the install wireless registration app by entering the S/N  to ape 120's registration number, multiple times, to no avail. Now I can't replace the S/N number as there's an issue between a Q or a C... and an error message occurred which I didn't manage to catch

Dear, oh dear, this ain't working out. Tried q reset by using a pin-clip, then checked my router, found the Sophos APX 120, went online and deactivated the XGS107 local wireless application. Then, on Sophos Central and used the install wireless registration app by entering the S/N  to ape 120's registration number, multiple times, to no avail. Now I can't replace the S/N number as there's an issue between a Q or a C... and an error message occurred which I didn't manage to catch

Sorry to hear that. Are you saying you might've entered the wrong serial number ("Q" instead of "C"), and now Sophos Central won't let you enter a different number to register it? You can register multiple APs with Central so I don't think the wrong serial number should hold things up -- that is, Central might still be waiting for the wrong serial number but you should be able to enter the new one.

Or is the problem different? Worst case, I think Central times out waiting for your device after 20 minutes or something like that and you'd have to start over anyway. (And by "start over" I mean resetting AP, entering info in Central, etc, the whole thing, not just the last step.)

Thanks, Wayne, it looks as if the registration wire is hardwired into the registration box. I'll try again tomorrow.. after which I'll reach out to the helpdesk... again...