I tried upgrading to fw 4.3.1 while keeping my old BB and got it to work, however I don't like the 1 signal bar and don't exactly need the unlock so I tried restoring to 4.3.1 with the stock BB but I keep getting 1013 errors even though I'm running tiny umbrella nor do I have my host files changed. Am I doing something wrong? Maybe I'm supposed to be doing DFU restore?