Hi Leezone. I think there should be some clarification here: 4.2 (the OS only) has been released in beta format to some distributors for stability testing. I have the same unfinished beta version on my own Audya and we used it on the UK roadshow recently without any problems at all. However the final version has not yet been released and we are under instructions not to distribute the beta version. When Ketron Italy are happy with the results and the additional software is fully completed the whole package will be released by them.
Here in the UK installing third party software onto the Audya will a;most certainly invalidate the warranty and the user will no longer receive free support from Ketron UK.