I have a Netvanta 7100 with 2 NV160 AP. Would like to update the firmware on the AP's but the AP Firmware Upload section on the 7100 says I need an '.bidp' file -- only firmware I can find is an '.img' file. Netvanta is running R11.10.7.HA.E AP's are currently on NV160:1840-44-1:6.5.5.15 -- looking to move to NV160_1840-44-1_6.9.2.2 What do I need to do to make it happen?