Despite the locked bootloader, dedicated community members have found two main paths to running a custom ROM: 1. Hardware eMMC Modification
Rather than a full Android replacement, this is a compilation toolchain for BB10 that brings Unix tools (like Vim and Git) to the original OS. Known Issues & Limitations blackberry passport rom
To provide the necessary hardware and software instructions for users to convert their own Passports to Android. Best ROM Options for BlackBerry Passport Despite the locked bootloader