Once Apple stopped signing an older iOS version (usually a week after a new one launched), you could never go back. If iOS 7 made your iPhone 4 sluggish, you were stuck. If a jailbreak was released for iOS 6.1.3 but you had accidentally upgraded to 7.0, you were out of luck.
It retrieves and saves your device's unique SHSH files locally or to external servers (like Saurik's). These files are the "keys" required to install older iOS versions that Apple no longer officially signs. tinyumbrella windows 7 32 bit
If you have an old Windows 7 32-bit machine and an iPhone 4 in a drawer, you now know what to do this weekend. Just remember: save those SHSH blobs before Apple – and time – erase them forever. Once Apple stopped signing an older iOS version
If TinyUmbrella fails to open, your Java installation is corrupt or missing. Reinstall JRE 7u80 32-bit. You’ll know TinyUmbrella is working when you see the iconic green umbrella logo and a clean interface displaying “Connected Devices” as empty. It retrieves and saves your device's unique SHSH
You may need to disable firewalls or background services like IIS (Internet Information Services) or Apache, as they can block the ports TinyUmbrella needs. Installation and Usage Guide