I just installed the 1.1.3 baseband downgrader and it does work! Unfortunately it's only for iphones with the 3.9 bootloader. I was on 1.1.3 with 04.03.13g baseband. First i restored to 1.1.1 that left me with the upgraded baseband, then came across the program in installer. I said what the heck, i'll try it, nothing to lose if it doesn't work i'll just upgrade back to 1.1.3, but it did work and so here i am with 1.1.1 and everything working, also got rid of that annoying incorrect sim error message!!! So for those with the 3.9 bootloader and don't 1.1.3, at least now we have the option to go back to other firmwares..BTW it downgrades your baseband back to the 1.0.2 baseband..