when booting the phones, some of them got a displayed message saying TFTP file not found. I reset them and i'm still getting the same message. What is confusing me is that all these phones were working great a week ago.
When the phone boots, it looks for two files, RingList.xml and DistinctiveRingList.xml, where you should define available downloadable Ring Tones. Both files, as well as ring tone RAW files should be defined as TFTP files.
You can find more information as well as configuration examples in the "Configuring Ring Tones" section in "CME Configuration Guide".
Turn the Debug on, on the CME. There are about 4-5 files that the Phone will look for when it is first connected. With this debug turned on you will see which file the phone is looking for and whether it found it. All the files must exist on the Flash and be configured in the CME CLI as follows:-
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