F(x)tec Pro1X (fxtec-qx1050)

Fastboot
Hold down and  while the device is off until you're in fastboot mode.

Recovery
Hold down and  while the device is off until you're in recovery mode.

Bootloader
Hold down and  and plug in the USB cable while the device is off. The device should now be in QDL mode.

Deep Flash Cable
If your bootloader is corrupted, the deep flash cable can be used to reflash the bootloader or other part of the device.