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Come visit us sometime #Asterisk on irc.freenode.net...

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Recovering from busted flash upgrade

Ok, you've attempted to upgrade your GXP-2000 firmware and something went wrong.

Bricked phone? Maybe. Maybe not!

Power it on. If the MWI light is blinking, it may be recoverable.

Connect your phone to a PC back-to-back. Run tcpdump or ethereal to capture packets. Power your phone on. Hopefully you should see dhcp requests, and tftp requests. Look for the IP address the phone is trying to tftp from. Assign this ip address to your PC, and enable tftp server on it. Put the boot55.bin and gxp2000.bin files in the tftp directory.

Reboot the phone. If all goes well, you should see the phone retrieve the files via tftp, flash itself, and you should have a working phone again!

Thanks to _Sam-- on #asterisk for the info.

Andrew's experience
I have found that you need to set your PC's IP address to 168.75.215.188 with a netmask of 1.0.0.0 since the phone is sending packets from 192.168.0.160.
The above procedure worked flawlessly when the phone was unplugged during a flash upgrade.
All this came about because a call came in at the exact moment that the phone was upgrading itself (firmware shouldn't have allowed that in the first place) and the speaker started howling a god awful noise, so the user unplugged it!

Edgar's experience
I have a phone doing this for no apparent reason - just started doing it. Doing the above steps did not fix the situation even though the phone
downloaded all the files! Probably going to RMA the phone.