The primary reason users search for is speed and control. iTunes downloads can be notoriously slow or prone to timing out. Direct links allow for the use of download managers, which can resume interrupted downloads and utilize your full bandwidth.
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openssl sha1 /path/to/your.ipsw
Once you have located your desired link, downloaded the file to your computer, and verified that it is currently signed by Apple, follow these steps to install it. Prerequisites
A corrupted or incorrect IPSW can "brick" (permanently disable) your device.
It is also worth noting that while the Unlocks Hub channel provides educational videos on this process, if you are looking for a ready-made custom IPSW from them, it is typically not a free service.