SIP-T46G Upgrade from old Firmware

Hi,

I'm just wanting to know if I can upgrade a T46G from 28.71.1.16 (v71) to 28.80.0.70 (v80) straight? In other words, do I need to upgrade to v72 first, then v73, and then finally v80, or can I skip v72 and v73?

Thanks,

James