• For almost all users: not possible — Apple does not sign iOS 6 anymore and downgrading is effectively impossible without previously saved SHSH blobs and advanced exploit-based tools. Attempting unofficial downgrades carries significant risk and is unsupported.

• Device: iPad Mini 1st Generation (Late 2012).
• Release OS: iOS 6.0.
• Architecture: 32-bit (Apple A5 Chip).
• Security System: Apple utilizes a "signing window." To install an OS, the device must verify the installation with Apple's servers. Apple stops "signing" older OS versions shortly after a new one is released.
• SHSH Blobs: These are unique digital signatures required to bypass the signing window. Without them, installation of an older OS is impossible.

To use any community downgrade tool, your device must first be jailbroken on its current firmware. For iOS 9.3.5/9.3.6: Use the Phoenix jailbreak. downgrade ipad mini to ios 6 verified