The Android modding community has long relied on Fastboot—a powerful command-line tool that allows direct communication with a device’s bootloader. For enthusiasts looking to root their devices, install custom ROMs, or simply break free from carrier restrictions, unlocking the bootloader is the mandatory first step. However, this journey often hits a frustrating roadblock: the error message .
If you use fastboot flashing unlock on a device expecting fastboot oem unlock , you will get the "unknown command" error – and vice versa. fastboot flashing unlock failed -remote unknown command-
OnePlus uses fastboot oem unlock . However, on newer devices (OnePlus 9/10/11 series), you may see unknown command if the bootloader is already in "locked" state and you use fastboot flashing unlock . The Android modding community has long relied on
You might need sudo for fastboot commands if udev rules are not set. However, running fastboot as root changes the environment slightly. Some bootloaders misbehave when fastboot runs with elevated privileges. If you use fastboot flashing unlock on a