It looks like it’s finally connected to the V3 stack.
I’m unsure which change cured the issue (still unable to figure out the current firmware version, @kersing’s link seems dead), but I’ll share the Gateway Settings I’ve used for future referece:
Gateway ID: <gatewayId>@ttn
Account Server: https://eu1.cloud.thethings.network/
Gateway Key: <apiKey>
Hopefully this will help if someone’s trying to follow The Things Kickstarter Gateway | The Things Stack for LoRaWAN.
Maybe the documention should have a sub-section detailng the registration procedure if one’s to use TTS CE.
Cheers