mod us :
it says on my mother bord box supports am3 + cpu eith new bios b2 stepping ready
Okay, well there's a difference between the
motherboard you linked and the MSI board of the same product line that has an AM3+ socket. If your board is the one from the Amazon link, then
this is not your motherboard.
Make absolutely sure which is your motherboard, because the AM3+ CPUs have one more pin than the AM3 socket, and thus
will not physically fit. No BIOS upgrade can change that.