After obtaining an ip from DHCP (with option 66 pointing it to the tftp server) it will connect to the tftp server and start fetching firmware. Once you do that the phone is wiped and it reboots in search of new firmware. While holding #, connect an AC adaptor to the phone.Ĭontinue to hold # until the line buttons blink amber. To force the upgrade I had to do the following: Power off the phone. To do the upgrade you need the a tftp server and option 66 defined on your dhcp to tell the phones where to look for the files. If you’re running firmware older than 8.3 you need to update to a firmware level between 8.3 and 8.5.2 before you upgrade to firmware 9.x.įrom the firmware 9.2 release notes: "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)." Luckily the firmware is all available on the cisco site as long as you sign up for a free account.
I’ve been working on bringing some old cisco 7911G’s up to a recent sip firmware so they can be used with asterisk.
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