Grainfather G40 will not update boil temperature setting

I've tried reaching out to the Grainfather Tech support on this issue but they have unfortunately been no help for about a month now. Has anyone else had this problem, and if so found a solution? Are other G40 users able to adjust their Boil Temperature? (Perhaps someone is willing to test - maybe I have a faulty unit!).

I live in an area where Boiling is not 212ºF / 100ºC, so I need to adjust my boil temperature down to 206ºF on the G40 controller so it will properly begin the boil timer. However, whenever I attempt to change it, it does not "save" the new temperature setting in the Boil Temperature Menu.

I notice that when adjusting the temperature, the yellow "highlight/selection" indicator remains on the Back Arrow on the top left of the screen, so that when I press down to get to the desired boil temperature and then hit "Set," it acts as if it is selecting that Back Arrow, and cancelling the new Boil Temp entry. You can see the yellow highlight on the Back Arrow in the image below (normally it is white when going through the menus while highlighting other areas. I've tried long pressing, but that doesn't seem to do anything.

Thank you for any advice!

Yellow Back Arrow when setting boil temperature

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White Back Arrow when another menu item is selected