Currently running 6.3.1 successfully on a Linkstation 1 (PPC). Is this (oldest) variant of Linkstation up to running 6.5, and has anybody successfully tried it?

I appreciate that browsing Slimserver may be pretty slow (not that fast on 6.3.1 anyway), but to be honest I'm not really bothered so long as it still serves music to my SB3 reliably.