CP 7911G IP PHONE Display does not work after factory default reset.

[Julio Costa]

Greetings!
I have a 7911G IP phone after factory default reset (123456789 * 0 #) He constantly rebooting to upgrading information for more than 10 hours.

I called the source of the equipment and when the MWI light began blinking, I used the # key and enter the following sequence exactly on the keyboard:
(3491672850 # *)
After this command the completed the 7911 sequence however no longer turned on the display, respende to ping because the DHCP server ip gift reserved for MAC.

I request the help of you, nessecito finalize this service and I have no solution yet.

Thanks in advance!!!

Júlio Costa
julio.costa.jca@gmail.com
+55 71 9113-2778

[Charles Hill]

What is the default firmware for your 7911Gs? 

It's possible your default firmware requires a interim upgrade before the final upgrade. 

For all SCCP firmware upgrades from firmware release versions earlier than 8.3(3) to Version 9.2(3) or

later, you must first upgrade your firmware to an intermediate Version (8.3(3) to 8.5(2)) and then upgrade

to 9.2(3).

http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/firmware/9_2_3/english/release/notes/7900_923.pdf

We attempted an upgrade that wasn't allowed and the phones were stuck at upgrading indefinitely.

Hope this helps.

Please rate helpful posts.

Thanks.

[Julio Costa]

Charles!

I can not upgrade because the reset (3491672850 # *) made the display stops working. Only see the LEDs flashing properly and after a while the machine restarts.

CP 7911G Display does not work after factory default reset.

Julio Costa
julio.costa.jca@gmail.com
+55 71 9113-2778

[Yannick Vranckx]

TFTPD is a tool that can do all this

Grab the firmware, install the tool. Let it handout adresses with the tftp parameter adjusted to your computer and the phone should upgrade.

With wireshark you can see if the TFTP is being passed

[Julio Costa]

Charles!

I can not upgrade because the reset (3491672850 # *) made the display stops working. Only see the LEDs flashing properly and after a while the machine restarts.

CP 7911G Display does not work after factory default reset.

Julio Costa
julio.costa.jca@gmail.com
+55 71 9113-2778

[Gordon Ross]

If you Wireshark the phone, you'll probably still see it trying to upgrade via TFTP. My guess, as per Charles, is that the old firmware on the phone was too old and you need to go via 8.5(2) firmware.

GTG
 

[Julio Costa]

Gordon,

Yes, I agree with that, but with the display off because of the reset I can not configure the IP TFTP sertidor the CP 7911G.

Is there any way to update the firmware?

Thanks for answering

[Gordon Ross]

First go and download the 8.5(2) firmware for the 7911 from cisco.com

Next, setup a standalone TFTP server and unzip the firmware into the TFTP's directory.

Alter the DHCP settings for the subnet the phone is plugged into to temporarily point to your standalone TFTP server (or just setup a separate subnet just for this type of thing. It's a useful thing to have around)

Then plug the phone into the network and leave it. It *should* upgrade itself - although the display will show nothing until the upgrade is complete.

GTG

[Charles Hill]

Just to add to what Gordon has stated,

we resolved a similar issue by uploading the firmware to the call manager and changed the phone load to the new firmware only on the phone in trouble.  Once the phone came back up with the new firmware I removed the phone load from the phone configuration and reset the phone.  Then it upgraded to the default firmware.

if it's not grabbing an ip, the upgrade will not work and may need to be rma'd.  But I would try the new firmware.

Hope this helps.

[alanbatres]

Yes, you will need a PWR-CUBE to power up the phone, connect the phone directly to your laptop or pc, run the tftpd server (DHCP and TFTP), unzip the firmware on your root directory and then you will see that the firmware is loaded to the phone, after that process the display will be working again.

Regards.