soldered

I purchases a mini windows pc from China to play around with and was wondering if it is possible to upgrade the current soldered in CPU? It currently has an Intel Atom Z3735F processor. If it is possible to upgrade the CPU should the new CPU be one from the same series or could I go with a newer...

I'm was wondering to delid a e3-1245 v6, but if it's already soldered there's too much risk for me. I just want to replace the tim if its not soldered. Else I just have to get another cooler ;)