: BlackBerry utilized a "Root of Trust" that injects cryptographic keys into the hardware itself.

Some developers investigated creating a modified version of the stock Marshmallow (6.0.1) firmware, but these are largely "debloated" versions of the original OS rather than true custom ROMs.

: As of 2025, software-based secure boot exploits are being explored, though they are not yet considered "plug-and-play" for the average user. The Reality of Using a Priv in 2026