If memory serves correctly. You need to go from firmware version 3 to 4 to 5
and then you can jump to 7. or something like that.
I just did this upgrade today. I went from 3.<something> to 5.0. When I tried to go to 7.4, the phone would continually try to upgrade and then reboot without finishing. I went to 6.3 without issues, but still couldn't go to 7.x (same symptoms).
I googled a note that mentioned the continual reboot issue, and said the solution was to remove all of the comments and blank lines from SIPDefaults.cnf. Once I did this, I could upgrade to 7.0 and then 7.4.
Ken
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