Older Apple devices containing the hardware exploit (iPhone 4s through iPhone X) can bypass signature checks at a hardware level. Because this exploit exists in the read-only memory (ROM) of the chip, Apple cannot patch it with a software update. This makes tethered or untethered downgrades possible on legacy devices using free developer tools. 2. The SHSH2 Blobs Method (Software-Based)
Sunstrm is a tethered downgrade tool designed for older checkm8-vulnerable devices (iPhone 5S through iPhone X). Free Requirements: A Mac or Linux computer.
You can install slightly older signed versions (usually 1-2 months old) using supervised mode and DelayOTA profiles. Not truly unsigned – Apple still signs these temporarily. unsigned ipsw restore tool free
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Truly free, open-source, and highly reliable if blobs are available. 2. Tenorshare ReiBoot (Free Trial/Limited) Older Apple devices containing the hardware exploit (iPhone
Your ability to use free unsigned restore tools depends entirely on your Apple device's processor. A7 to A11 Devices (iPhone 5s through iPhone X)
A popular free Windows utility that packs a huge number of iOS management features, including the ability to flash (restore) signed and unsigned firmware. You can install slightly older signed versions (usually
Does not support modern devices (iPhone XS and newer). Step-by-Step: How Free Unsigned Restores Work (Concept)