[Twiz O'meter/BigToM/ToM+] Update to firmware 2.4

Thank you all for the great tricks, hints and hidden features, it's such a helpful community here, I'm very happy

Delvecchio schrieb: I attach the fix for the gear letter.
You'll find also a new settings, in the advanced webUI page: "Wheel circumference factor".
It was asked by a very new BigToM owner (he is waiting for the delivery of the device), who has wheels with a little larger diameter and so the speed and driven Km aren't corrected displayed by the original speedometer.
Normal factor is 1,000, if for example, you have wheels with +0,5 cm (= +0,3 %) bigger than standard ones, that means you have to enter 1,003 (it works like a multiplicator factor).
I had no much time to test this features, so, in case you see strange things, please report here.

Two success feedbacks: I did my first OTA update with success, and the small bug with the gear-letter is gone. Thank you!