In this case, check the “Use Latest Firmware” box and click the Refresh Debug Tool Status Icon in the
MPLAB X IDE dashboard display. If there is still an asterisk next to the Application version number, or the
debugger issue is not resolved, proceed to the following steps for bootload mode.
Also, refer to 11.2.2 Indicator Lights Strip for more information on light strip modes and bootloader errors.
Perform the following steps to force the debugger into bootload mode:
1. Disconnect the Micro-B USB cable from the debugger.
2. Press down on the MPLAB PICkit 4 logo and hold while plugging in the Micro-B USB cable. The light strip
flashes purple. Continue pressing the logo until the light strip stops flashing and changes to steady on purple.
You are now in bootload mode.
3. Try to reestablish communication with the MPLAB X IDE or MPLAB IPE. If successful, the latest firmware is
downloaded. When complete, the LED is steady on blue and the debugger is ready for operation.
6.3.3 How to Use the Hardware Tool Emergency Boot Firmware Recovery Utility
Only use this utility to restore hardware tool boot firmware to its factory state. Use only if your
hardware tool no longer functions on any machine.
The debugger may need to be forced into recovery boot mode (reprogrammed) in rare situations; for example, if any
of the following occurs when the debugger is connected to the computer:
• If the debugger has no LED lit.
• If the procedure described in 6.3.2 How to Invoke the Bootload Mode was not successful.
YOU MUST USE MPLAB X IDE V4.15 OR GREATER TO USED THE EMERGENCY RECOVERY UTILITY.
Carefully follow the instructions found in MPLAB X IDE under the main menu options
Debug > Hardware Tool
Emergency Boot Firmware Recovery.
Figure 6-2. Selecting Emergency Utility
The figure below shows where the emergency recovery button is located on the MPLAB PICkit 4 In-Circuit Debugger.
Troubleshooting
© 2020 Microchip Technology Inc.
User Guide
DS50002751D-page 34
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