FASTBOOT Error: Failed to boot into userspace fastboot; one or more components might be unbootable.
The phone didn't show the error. Instead, the manufacturer's logo stayed on the screen. Then, a white light pulsed. Then, a setup screen: Welcome. FASTBOOT Error: Failed to boot into userspace fastboot;
Use fastboot reboot fastboot while in bootloader mode. a white light pulsed. Then
Download the latest for Windows, Mac, or Linux. FASTBOOT Error: Failed to boot into userspace fastboot;
The most common culprit is a driver mismatch on Windows. Even if your PC recognizes the device in the standard bootloader, it may fail to recognize it once it tries to switch to userspace.