I was suggested to move into this forum from this thread. I was trying to upgrade my 3GS to ios 6 because I couldnt run some apps, like facebook. I figured that might help. I waited until I kind of had a few days free where I wouldn't need my phone *just in case* something like this happened. It all started when I did this step: Put your phone in DFU mode and let iTunes download the most up to date version of iOS(6.1.6) and restore your phone. Once it did, it said it couldn't find the SIM card. So I started looking into how to fix this. I came across this video and tried to follow along. I DL'ed the two files he recommended (redsn0w_mac_0.9.15b2) and (iPhone2,1_6.0_10A403_Restore.ipsw) and ran the app. When it asked "Is this a newer (fixed) model?" I initially chose no as it mentioned to look at the 4,5th digits of the SN. I later found a thread that said yes thats the week but the 3rd digit is the year. Either way, my SN starts with 88122, so I assuming thats 2011, week 22 or in other words, I have the 'newer (fixed) model'. Initially when I selected no, I couldnt get it to flash the baseband. I would get a: Missing Keys.plist data for this build error. I was able to get it to work by deselecting "Install iPad baseband". It went through the first time and seemed to work, but then when it was done, the device wouldn't boot up. I would hit the power buttons and nothing would happen. I googled around and also opened itunes and it is telling me the device is in recovery mode. I tried running redsn0w a few more times and was able to get it to reboot and got it back into DFU mode. From there I was also get it to flash the baseband once I selected 'yes' for the newer (fixed) model question. I also downloaded a newer version (redsn0w_mac_0.9.15b3) which I was using to try and make this work. However, still can't boot this thing up. I would be happy to just get either OS working at this point, 5 or 6. Any suggestions? I am feeling like I just got in way over my head. Edit: I was able to get itunes to restore it to a working state. however, when it boots up, it asks to be connected to iTunes. When it does, it still tells me "There is no SIM card installed in the iPhone you are attempting to activate." ... disconnect and insert a SIM. This phone on occasion I had to take the SIM card out and put it back to get it to recognize it. However, it was working fine when I started this process. I took it out 2x and it went from saying "Searching..." to "No Service" after the 2nd time... However, still stuck with a non-working phone at the moment.