Updating phone firmware
When you restore an i Phone, it erases the i Phone back to factory settings updates it to the latest version of i OS, so you’ll end up with a blank i Phone running i OS 10.
If you have an i Cloud backup, you’ll be able to sign in and restore from your backup as part of the setup process — just make sure you know your Apple ID and password.
If you back up your i Phone to i Tunes, you’ll need to connect your i Phone to your computer at home to retrieve your data.
If you If you’ve connected your i Phone to i Tunes after updating to i OS 10 and you’re getting an error that says “The i Phone could not be restored.
This is the recommended and safe method for firmware upgradation.
There are lot more ways to upgrade Cisco IP phone firmware, I would like to share all possible ways one by one.
Just slide your fingernail under and the tiny plug detaches without lots of pulling force.
Then leave it out for a few seconds,a battery with a red exclamation point should show up and that is when you insert the battery and turn it back on. What worked for me : Remove plastic snap on back cover.
I charged it enough to get into their unlocked phone and found enough clues to find the owner (but no nudes ;-).