[Asterisk-Users] Cisco 7940 Upgrade Failing

[Rich Adamson]

> Does anyone know how to get a Cisco 7940 w/FW ver 2.0.3 to v3x and above.
> Can't get it to upgrade on its own via TFTP.  Phones w SCCP image will
> upgrade fine but I can't get these 2.0.3s to start the firmware upgrade.

On some older 79x0's, we've had to delete a bunch of the config statements
within the *.cnf files in order to upgrade. Deleting comments and the 
majority of statements won't have any impact in terms of upgrading, just
make sure you keep a full copy of the files around so that once the
upgrade is complete, you know what parameters were there to start with.

The above is based on upgrading several used 79x0's (with experience).
Seems not all phones were created equal (eg, maybe differences in buffer
sizes, nvram, or something).

I never did try to figure out why some worked and some did not without
deleting that stuff.