Why may you need to use the Recover Button?
When updating your Controller's firmware, something could go wrong and cause the Controller to get stuck in Device Firmware Update (DFU) mode.
How do you know you need to use the Recover Button?
You will know that you need to use the Recover Button when the power indicator light is flashing red while you are trying to update your Controller's firmware.
How to use the Recover Button
Make sure the Controller is plugged into your computer.
Select the Controller icon in the Toolbar.
Select ‘Recover (Fast Red Blinking.)’
A text box will appear and explain when Recover mode is used and that you should choose the "Controller FW Upgrade device". Select "Continue" on the text box to open the connection window.
Select "VEX IQ Controller FW Upgrade".
Select the "Connect" button.
Wait while the firmware updates.
The update will complete.