Tried the drone here, and it worked fine! I did have an idea that it may have been a login issue, because the reboot loop started when the controller connected to the drone and the controller was giving a login error (because we had no internet, duh!). So perhaps the brainiacs at DJI have an error where after 30 days it fails (or I was unlucky and hit a certificate expiry or something).

Anyway, the little drone flies again! Happy bunny…