. Older versions often fail to hand off the connection to fastbootd. GrapheneOS Discussion Forum 2. Install Userspace Fastboot Drivers
Using old fastboot binaries that do not support modern fastbootd/userspace commands.
In modern Android devices (especially those launched with Android 9+), there are two Fastboot modes: Detailed Summary of Command Sequences fastboot devices Enter
Is your phone currently showing the or a recovery screen ? Share public link
If the device still won't enter fastbootd, re-flash the essential stock images to restore functionality, ensuring you flash boot , dtbo , and vendor_boot before attempting fastboot reboot fastboot . Detailed Summary of Command Sequences fastboot devices Enter Userspace (fastbootd) fastboot reboot fastboot Flash Boot Image fastboot flash boot_a boot.img (or _b ) Flash Vendor Boot fastboot flash vendor_boot_a vendor_boot.img Switch Slots fastboot --set-active=a Summary of Solutions to Try Update platform-tools to the latest version. Flash vendor_boot.img to fix corrupted boot partitions. Switch the active slot using fastboot --set-active . Flash vbmeta.img with ---disable-verity . and odm .
Open a Command Prompt (or Terminal) inside that exact folder. (On Windows, type cmd in the file explorer address bar while inside the folder and press Enter). Connect your phone in bootloader mode and type: fastboot devices Use code with caution.
A secondary mode hosted within the recovery image. It is required to modify dynamic partitions like system , vendor , product , and odm . ensuring you flash boot
If successful, your device screen should change to a menu that explicitly says "fastbootd" at the top. 5. Flash Stock Firmware (Last Resort)