Android Bootloader Unlock 2026 Fastboot Guide
Unlock the Android bootloader with official fastboot commands. FRPB reads OEM state, sends the unlock, verifies the result over USB. Free Windows tool.
Unlock the bootloader on a device you own using the vendor's official fastboot commands. FRPB reads the OEM unlocking flag, runs the correct unlock sequence for your chipset and confirms the state change before you flash anything.
What the Bootloader Unlock — Fastboot covers
Reads OEM Unlock State — Queries the bootloader directly so you know whether OEM unlocking is already enabled before starting.
Official Fastboot Commands — Sends the vendor-sanctioned unlock command for your OEM — no patched bootloaders or exploits.
State Verification — Re-reads the unlock flag after the reboot so you can prove the bootloader is actually unlocked.
Fastboot Driver Setup — Installs the Google USB and OEM fastboot drivers on demand when the device is not detected.
Step-by-step: how to do it with FRPB
- 1Enable Developer Options and OEM unlocking: Tap Build number seven times, open Developer Options and turn on both USB debugging and OEM unlocking. The OEM toggle stays greyed out on carrier-locked and Knox-protected units.
- 2Boot into fastboot mode: Power off, then hold the vendor key combination (or run adb reboot bootloader) until the device shows the fastboot screen.
- 3Connect the device and confirm detection: Plug the phone in over USB and let FRPB run fastboot devices. If nothing appears, install the fastboot drivers from the same panel.
- 4Send the unlock command: FRPB issues the correct unlock for your OEM — fastboot flashing unlock on modern devices, fastboot oem unlock on older ones — then reboots and reads the flag back to confirm.
Frequently asked questions
What does unlocking the bootloader actually do? It removes the firmware-level restriction that only allows vendor-signed images to boot. Once unlocked you can flash custom recovery, patch boot images or install a different ROM — and it also wipes all user data as a security measure.
Does bootloader unlock erase my data? Yes. Every Android OEM wipes userdata when the bootloader is unlocked, because the operation removes the encryption keys tied to the locked state. Back up photos, contacts and app data before you start.
Why is OEM unlocking greyed out on my phone? OEM unlocking is disabled by carrier-locked units, some Samsung Knox configurations, and devices still inside a carrier payment plan. On those units the toggle cannot be enabled and the fastboot unlock command will be rejected by the bootloader.
Can I relock the bootloader afterwards? Yes, with fastboot flashing lock — but only after restoring a signed stock firmware image. Relocking while a modified boot image is installed will brick the device, so FRPB verifies the current slot state before it lets you relock.
Which brands support bootloader unlocking? Pixel, Xiaomi/Redmi/POCO (after the Mi Unlock waiting period), OnePlus, Motorola, Nothing, Sony and most Qualcomm reference devices. Samsung Galaxy phones use Download Mode instead of fastboot, and iPhones have no bootloader unlock at all.
Is bootloader unlocking legal? Unlocking hardware you own is legal in most jurisdictions, but it voids the manufacturer warranty and may breach carrier contract terms. FRPB requires you to confirm ownership before every run and keeps a local operation log.
Is the FRPB tool safe and legal to use?
FRPB is built strictly for authorised device owners and licensed repair professionals. Always confirm you own the handset — or hold explicit written permission from its owner — before running any recovery or unlock module.
Everything runs offline over a local USB connection. The installers are code-signed and adware-free, so you can trust exactly what runs on your machine.