How To Update A Server?

[eSpox]

Hello,

I got a working 8.42 server. We want update it to 8.5 but wanna use same map and npc's. Possible or impossible?

I already tried it but very much errors(Npc's,Tiles...)

So how I can do it?

 

[Xitis]

i need to update my server from 8.5 to 8.52 pls tell me, thanks.