Trying to enable 64 bit kernel

[Nachteule]

There is currently no 64bit XBian if that's what you mean.
But you can manually install the 64 bit versions of the glibc and python libraries, of course all at your own risk.

When the work for the support of the Raspberry Pi 5 is done, we will probably work on a 64bit version of XBian. But that is a lot of work, starting with the fact that the Repository generation is only for armhf and not for arm64. It will take many many weeks until something usable is created.