Is this something I missed?

I tried to login to my dediserver today, but I got that message:

Host is LFS S2 0.5 U

and then just clicking OK and coming back to screen before...

I thought the testpatches should be compatible?

(I think I have U11 or so...)

I guess I have to reinstall to get back to U then...

because of u test patches and cheating, all patches between U1 and U18 arent compatible, so update to U20 and it will be