Samsung Galaxy S II :: "Failed To Verify Whole-file Signature"

I have a Galaxy S2 GT -19100 from Sprint. I am fairly computer/tech savvy and previously had an iphone which I jailbroke, but have moved on to the wonderful, open architecture of Android.Right out the box I downloaded Odin and quickly figured out how to root the phone. After customizing it and downloading numerous apps, I quickly realized that the phone has a bug that causes it to drop calls and lose it's signal. I waited patiently for an update, however when the update finally came out, it was apparent that my phone would not update. It would try to reboot and then it would hang on the message of E:"Failed to verify whole-file signature". I tried some simple solutions such as wiping out the data and doing a factory reset. When I tried solutions that involved loading something from the SD card, it gives an error that it won't mount. I don't know if that's because it is looking for an external card (which it doesn't have) or if it's not "mounting" the internal one.

I have ROM Manager on my phone which has a Clockwork Mod Recovery option that I tried using, but like the example above, it hangs on the same message.Another site suggested that when something like this happens, you need to flash the kernel. I was going to try and use Odin to do that, but I am unsure of which kernel would be appropriate. Half the problem seems to be figuring out which kernel I currently have. I do not seem to be getting the same information as other get when looking at "About Phone" in the settings.Here are all of my specs:

Model number: SPH-D710
Android Version: 2.3.4
Baseband version: s: D710.10 S.EG30
Build version: Gingerbread.EG30
Kernel version: 2.6.35.7

Other websites tell you to find your kernel version by checking the phone and that it should be something like: 2.6.35.7-I9100XWKF1-CL256340 root@DELL106. All I have is 2.6.35.7.