I have 8 files on my computer with similar names like iPhone1,1_1.1.1_3A109a_Restore.ipsw or iPhone1,1_2.1_5F136_Restore.ipsw, each with different save dates ranging from September 2007 to September 2008. Each file is about 150mb. I don't know what these files are and want to delete them to create more space on my computer. My concern is that I might be deleting something important for the two iphones in our house. ANybody know what this is and if its safe to delete?