ESXi stuck loading nimble_psp_direct

Hi

Started an upgrade from 5.5 to 6.5 using the update manager. As part of that process we have attached a a nimble baseline with the new nimble iSCSi connector.

Unfortunately the screen is now stuck showing 'Loading module nimble_psps_direct...'

My question is this, is there anyway to stop this loading or remove it, or are we on a road to booting from cd...??

thanks

john