Inaccessible OS due to ROM setting mistake

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http://forums.androidcentral.com – Long story short, with above average ROM knowledge, and two previous successful flashes under my belt, I flashed Slimbean JB 4.2.1 Beta1 for my Sprint GS3 SPH-L710, and all was quite fine until I messed with menu/security/SIM PIN. Though I thought I was setting it for extra phone security, I actually implemented an unknownst-to-me feature that upon the following reboot, the phone requested a PUK code for a now-locked SIM card (my phone doesn't have a SIM card by the way). After a long CS call to Sprint, including International Sprint, I was told to go to a local store. The short part of th (HowTos)