Skip to main content

U-Boot Button

The Radxa Cubie A7Z features an onboard U-Boot button for entering FEL mode.

Button Location

For the specific location of the U-Boot button, please refer to the interface description section in the Hardware Interface tutorial!

Usage Guide​

FEL is a low-level boot and firmware update mode in Allwinner chips, primarily used for system recovery or debugging when the device cannot boot from conventional storage media.

Entering FEL Mode​

To enter FEL mode, press and hold the U-Boot button on the Cubie A7Z before powering on the board, then release the button after power is applied.

  1. Press and hold the U-Boot button on the Cubie A7Z

  2. Connect the Cubie A7Z's USB Type-C port to your PC's USB Type-A port using a USB Type-A to Type-C cable

  3. Release the U-Boot button on the Cubie A7Z

Interface Specifications​

Technical Reference

For complete technical specifications and pin definitions, please refer to the Hardware Design: Schematic document in the download section.