You are using an iPhone 4 and you coincidentally updated to iOS 6.1.3, which cannot be jailbroken at the moment. Since you saved the SHSH blobs you think you can restore by doing a replay APTicket attack with TinyUmbrella or Cydia. Sadly iTunes shows errors like 1600, 1601, 1602, 1604 etc.
If you have an iPhone 4s or iPhone5 you can stop reading here. This article will not be able to help you. The iDevices with an A5 CPU or later cannot be downgraded with replay attacks at the moment. Continue reading →
GeoHot has had a reverse-engineerer’s look into Sony’s high tech gadget and Sony immediately declared war.
Obviously in panic, Sony announced to deactivate Linux (Other-OS) support with their latest firmware 3.21. This was the time when people were wondering how long it would take until GeoHot would reenable it.
The magic PUP files
So it did not take too long. That notorious hacking genious did it. He says he’s using a custom PUP file. A PUP file basically is an update file for the PS3. The interesting point is usually PUP files are signed by Sony.
Could that mean there is a major flaw in Sony’s implementation of checking the authenticity of update files (at least until firmware 3.15, which GeoHot mentions is the latest that allows to install his custom PUP).