Maybe not the best solution for you (because it will most likely remove all your data and it will install a rom different from the original) but probably the easiest: find update.img file (the name may be different, but you need the img format) - links should be available somewhere on this forum and flash it from the pc. The instructions for flashing probably also can be found on this forum. Or for example here:
http://www.icarusreader.com/files/Go...IlluminaXL.zip. The zip contains instructions (you need only step 1) with all necessary files. It also contains .img file but don't use it (it's for a different device).