SIP-T46G Upgrade from old Firmware

[keffa]

I just did this with five new handsets I purchased for a client and they are working fine.

Sometimes, though it is very rare, firmware does have to be updated like this but most of the time, the latest firmware incorporates all the previous fixes and additions so it's not required. The reason that they maintain older firmwares is that sometimes when they fix something, it can break something else so this allows you to roll back as it where, just in case this becomes problematic.