[Q] Straight Talk VZW Towers CDMA e4gt 4.0.4 want to upgrade to JB w/o losing fla

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http://forum.xda-developers.com – So i have an Epic 4g Touch running 4.0.4 Sprint rooted FF18. I want it to run Jelly Bean or CM10.1 It has been flashed from Sprint to Straight Talk (VZW) CDMA service. I had it flashed via remote the other day and it runs pretty well although the Verizon 3g data is pretty slow at times. I want to flash this phone to have Jelly Bean 4.1.2 or even 4.2 if possible and I am afraid i might lose the flash that has been done to the CDMA handset when i clear the data as part of the flash process. I installed a Galaxy 2 Mini rom to it and it was very smooth, tho data did not work nor did (HowTos)