What's difference of different MTSKR1905WF waterproof remote firmware versions?

[SoEFoil]

'Group Buy: Maytech 65162 Motor + Propeller + Guard! - #16 by ausdroid
March 9 2023:

@ausdroid

Of course, the biggest problem with anything that comes from Maytech is that there is zero warranty.

How is the Maytech waranty in December 2023 ?