P4300G2 upgrade issues

[Lithiumx]

I am currently trying to upgrade my two node P43000G2 cluster from version 8.1.00.0241.0 to the most recent version (I think it's 10).  When I try to do this I get an error saying that I can't upgrade as the Quorum will not allow this.  The reason I'm trying to upgrade is that I bought two new P4300G2's and need to add them to the cluster.  They are running version 10.0.00.1888.0.  So my question is how do I add these new nodes to my cluster?  Do I need to upgrade my current 8.1 nodes to version 10 and if so, how do I do that? 

Any help would be much appreciated.

[oikjn]

your FOM is running a 32bit version.  As long as your other two nodes are running their managers, you can just delete your old manager and install a new manager using the 10.0 media and then you can upgrade the real nodes.