It seems it is well and truly fubar. Here is what I can gather from the facts you've provided:
1. The save state that you need is in the default location, somewhere under "data"
2. Your phone is rooted.
It is only possible to access the data folder (and by extension, the fpse folder), if your phone is rooted. I searched for a non-destructive method for rooting the Thunderbolt, but to no avail. It appears you are out of luck.
However, I'm currently going through FFIX too, and will send you my save state if you like (I'm in Lindblum, just before the festival of the hunt). Let me know, and sorry, but it's the best I can do for you.
Platinum trophies: Uncharted, MW2, Uncharted 2, Resi 5, AC II, Fallout 3, Batman: AA, CoD: WaW, BlOps, FFXIII, BioShock, L.A. Noire, Deus Ex: HR, Uncharted 3, Heavy Rain, Batman: AC, inFAMOUS 2, The Walking Dead, Virtue's Last Reward, Borderlands