Thanks @John R for the vid, not only a thorough tutorial on the tc settings for V2, but a reviewer I’ve not seen before.
As I mentioned, I did contact SXmini/Yihi, and I received a reply this morning… Firstly, it is not possible to update the mod yourself, dongle or not. And exactly as @oORobOo said, it must be sent to France for updating.
“You will handle the shipping fee ship to France”
Making me pay £17 to ship it to France seems like piss-poor customer service. Just have to finally force myself to use Celsius