Texas Instruments SWRU294, User Manual, Page: 37 / 57

SWRU294
Page 37/40
11.1 Forced Boot Recovery Mode
If the firmware update fails and the evaluation board appears to be dead, there is a way to force
the board to only run the bootloader and stop all further execution. No attempts will be made to
start the EB firmware.
1. Turn the EB power off.
2. Rev. 1.3.0: Ground the USB LED test point shown in Figure 29a.
Rev. 1.5.0: Ground the USB LED test point with the GND test point in Figure 29b.
3. While doing as explained in the second step, turn the EB power on.
When the board is powered up, the bootloader will not attempt to start the firmware and it will
remain in control of the board. LED D6 (USB LED) will be blinking with a 1 second interval,
indicating that the bootloader is running. You can use the USB LED state as an indicator to
whether you have a working bootloader or not.
When the bootloader is running, the only functionality that is offered from SmartRF Studio and
SmartRF Flash Programmer is to load a new version of the standard firmware.
a) Revision 1.3.0 b) Revision 1.5.0
Figure 29
– Enter forced boot recovery mode