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Nexus S stuck in boot animation screen
I am new to rooting and mods, so please excuse me if I don't know what I'm talking about.
So, back in January I rooted my phone and installed CyanogenMod on my Nexus S. I flashed an unofficial version of ICS that I found on the internet and I got it to work fine (although it was very laggy). Now that Google is rolling out the Jelly Bean OTA, I wanted to get that. But, from what I've read, you need to be on the stock ROM. So, I successfully unrooted it and got it back to the original version. Then, I tried updating it to the official ICS OTA through the "About Phone" section in settings. But, now, my Nexus is just stuck on the boot animation screen (ICS version).
If I press the Volume Up + Power buttons, it goes into Fastboot Mode (see picture) and there are four options: Reboot Bootloader, Reboot, Recovery, Power Off. Notice it says it's in a "Locked" state. Does that mean it's not rooted anymore?
I clicked Recovery and it showed the dead Android. On that screen, I clicked the Volume Up + Power buttons and it goes into "Android system recovery <3e>". On that screen, there are only 4 options: reboot system now, apply update from /sdcard, wipe data/factory reset, wipe cache partition. I have tried wiping data and cache but it does nothing. There's nothing to apply on the internal SD card.
I'm not sure what to do now. When I plug in my Nexus into my computer, it does not show up as a USB drive so I can't put any files onto it. Any ideas on what to do? I have no idea what I"m doing. Thanks for the help!