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- Aug 30, 2012
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I cannot for the life of me figure out how to upgrade a T28 current firmware version is 2.61.23.15 (I think was a UK version) to the current 2.70. I have read something about doing something with the .cfg file but cannot figure out what to do. We are having some issues with the current firmware (blind transfers) and am pretty confident it is because of the firmware. I am hoping to get specific instructions, would be helpful.