I never had this problem since on my XA2 I enlarged the root partition and on earlier phones the size was not too large. I think a factory reset should do, but after a factory reset you will restart with the latest version you flashed and will have to upgrade through the necessary step releases. You could try though.
By the way, Jameson was also the default name of the ship commander in the '80s game Elite… So seeing that it was the same as my real name I stuck with that. 
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