Installing a custom ROM on a BlackBerry Priv is a unique challenge because the device was engineered with a "hardened" secure boot chain that has remained largely uncracked for years. While standard Android phones allow bootloader unlocking via simple commands, the Priv uses hardware-verified signatures that prevent unauthorized operating systems from booting.
Hardware Tools: An eMMC programmer (e.g., Medusa Pro, EasyJTAG) and advanced microsoldering skills to remove the glued-down chip. Blackberry Priv Custom Rom
Despite these hurdles, there has been some movement for dedicated enthusiasts and specific hardware versions. Installing a custom ROM on a BlackBerry Priv
No Official Unlock: Unlike Pixel or OnePlus devices, BlackBerry never provided a way to unlock the bootloader, making it impossible to flash a custom recovery like TWRP or a ROM like LineageOS. Unlock bootloader: Result: You cannot flash a custom
Result: You cannot flash a custom kernel, recovery (TWRP), or system image on a standard Priv. You are stuck with the stock BlackBerry Android 6.0.1 ROM.
What doesn’t:
If you are one of the few with an unlocked engineering unit or have performed the EMMC hardware mod, the general process would follow these steps: Blackberry Priv's custom android ROM? - CrackBerry Forums