For developers and advanced users, "A/B Multibooting" describes a redundant system architecture. Instead of one system partition, the device has two: and Slot B .

is a second‑stage bootloader that acts as a UEFI firmware layer on top of the device‘s native bootloader. Originally developed for Snapdragon‑based devices, EFIDroid allows multibooting of multiple Android ROMs, Ubuntu Touch, and even other Linux distributions without modifying the stock recovery or patching the kernel. Its advantages over older solutions like MultiROM include:

to the previous, known-working slot. This prevents "bricking" the device. Data Integrity:

White Paper: The Evolution of System Resilience Through A/B Multiboot Architectures 1. Executive Summary