You're interested in learning about TWRP (Team Win Recovery Project) and specifically the version twrp-2.8.7.1-p5210.tar.md5 . TWRP is a popular custom recovery software for Android devices, allowing users to install custom ROMs, kernels, and other modifications.
Unlike the original recovery that requires using volume and power buttons, TWRP offers a full touch-screen UI for easier navigation. twrp-2.8.7.1-p5210.tar.md5