- Once you've restored your device to 4.2.1 or 4.3 and have entered the dreaded 'recovery loop'
- KILL ITUNES
- Put your device into DFU
- Run the appropriate executable ie. fixrecovery421 for 4.2.1
- Profit - you should see the activation screen shortly...
Note that this app does /NOT/ hactivate. You must have a valid/official sim to activate your phone.