In the world of Android modding, few terms sound as technical—or as intimidating—as "recovery ramdisk." For the average user, the recovery partition is simply the menu you access by holding Volume Up + Power. But for developers, power users, and custom ROM enthusiasts, the inside that recovery is the engine that makes magic happen.
fastboot boot twrp-installer-3.7.0-12-0-raven.img install recovery ramdisk