I understand you're looking for information on restoring an unsigned IPSW using 3uTools. However, I need to provide an important clarification first:
(iPhone, iPad, iPod touch) through any tool — including 3uTools, iTunes, or any other software — unless your device is already jailbroken and you use specialized bootloader exploits (like SHSH blobs with futurerestore, and only on certain compatible devices/firmwares). how to restore unsigned ipsw with 3utools
(unlike iMazing or manual futurerestore). Bottom line: No tool — including 3uTools — can restore an unsigned IPSW to a standard (non-jailbroken, SEP-locked) iOS device. If you see YouTube videos or blog posts claiming otherwise, they are either fake, using a jailbroken device with custom bootloader, or demonstrating a different process (like restoring a signed IPSW that they mistakenly think is unsigned). I understand you're looking for information on restoring