I did this with my S5. It's not the easiest operation, but the nice thing about the device is that a factory reset is an actual factory reset, so you can always

I did this with my S5. It's not the easiest operation, but the nice thing about the device is that a factory reset is an actual factory reset, so you can always start over with factory firmware if you mess up. I use a Wireguard VPN to access the Vacuum's web UI to control it; it has no internet access at all.