To rollback the software to the previous version follow these steps
>Open the console session with codec by using RS232 cable with Baud Rate:9600
> Take backup of system configuration and option keys
> Restart codec and break the boot sequence
> Ctrl + Break(for hyper terminal), or Alt + B (for TeraTerm/Putty)
> “$” prompt will show feedback
> selectsw
> Wait for “Active application: x” message
> If x = 1, then selectsw 2
> If x = 2, then selectsw 1
> q
> Codec will automatically restart with previous sw version of Codec
This is also the sequence to break a codec stuck in a boot sequence loop.
(Same process for the telepresence C20)