Once Apple has stopped signing firmware SHSH requests for a firmware version there is no way to get your SHSH for that particular version. Apple stops signing firmware SHSHВ once a new firmware is out.With TinyTSS + the shsh blobs file(s) you obtained with Umbrella, you will be able to restore to the version of those shsh files forever! TinyUmbrella When iTunes verifies the firmwareВ restore for the devices listed below, it checks if you are allowed to restore to the version you are requesting. TinyTSS is a small java app that acts as your very own signature service. It savesВ SHSHВ signatures for your device received from the Apple server and let to downgrade OS indefinitely.

Apple stops signing older firmwares once a new one is out.ДЇirmwareUmbrella sends the same exact request that iTunes sends Apple when requesting the signatures for your device to be restored. If the signature does not match, the device raises an error and the restore process stops. If the signature matches then the restore process can continue. Your device checks the information and verifies the signature (making sure it really came from Apple because it CANNOT be forged as the encryption is very high). iTunes packages up this valuable information and sends it to your device. Apple takes the firmware version files and combines them with your ECID and generates a hash that ONLY APPLE can generate. It is signed with a unique id (ECID) that only your device has. See, the firmware is now signed for the below devices. The way they stop you is basically by a simple response that iTunes receives when you try to restore the firmware of your choosing. Once you вЂupgradeвЂ™ they donвЂ™t let you downgrade. When you try to restore an older firmware on the devices listed below, Apple wonвЂ™t let you do that.

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