I want to change from latin to cyrillic alphabet.
This request makes absolutely no sense. A much better, more reasonable, and awesome request would be if you wanted the Hungarian course to support Székely–magyar rovásírás:
I would be all for that! (It would be fairly easy for developers to implement as well considering the one to one correspondence of the modern system, although I guess it wouldn't be super useful considering that practically nobody uses it...)
According to Wikipedia there is a Hungarian Cyrillic alphabet used in Vojvodina: https://en.wikipedia.org/wiki/Hungarian_Cyrillic_alphabet I'm not sure that's actually the case, though; I can't find any mention of it on Hungarian Wikipedia, and the alphabet as given there doesn't mark vowel lengths, which would be very impractical for actual use. The second Cyrillic variant described on the page above seems more practical, if "confusing people by writing their language using a different alphabet" meets your definition of "practical" ;-)
I don't know about 1945 as I don't date back to that period :) but I can assure you that we don't use cyrillic for transcribing Hungarian in Vojvodina, as Serbian language uses both cyrillic and latin alphabets. One might only use it to simplify Hungarian pronunciation for a Serbian person learning Hungarian. In that case, a lot would be lost, since you can't transcribe ö, ő, ú, ű with any Serbian letter.
Quote from http://omniglot.com/writing/hungariancyrillic.htm : “The Hungarian Cyrillic alphabet was invented by Samuel P. Bateman, who wanted to make it easier for Hungarians to learn Russian as a second language.”
As already someone said here it lacks vowel lenghts. Wait, it does mark vowel length but it is wrong described in the article. This could be due to an inexperienced user who created the article.
Furthermore I could not find the inventor of the alphabet online other than at this old article at Omniglot (which now has a different design): http://omniglot.com/writing/hungariancyrillic.htm
Sounds really odd to me. Maybe it was only proposed and never used or I may be wrong and it is used in this region in Serbia.