It looks like you're likely referring to , a popular Android virtual machine app that allows you to run a secondary, isolated Android system (usually Android 7.1) on your phone. The "51" in your query likely refers to Android 5.1 (Lollipop) , as F1 VM is often used to give older devices running Android 5.1 the ability to run newer apps in a virtual Android 7.1 environment .
VM as a starter:
The "Starter F1 VM" isn't a physical machine. It is a meticulously configured Windows Virtual Machine (VM) running on a Linux host (or a low-spec cloud instance), stripped of all non-essential processes to dedicate every available cycle to physics calculation and telemetry. 51 starter f1 vm
: A standout feature that allows apps or games inside the virtual machine to float in a resizable window over the main device interface. Security & Isolation It looks like you're likely referring to ,