IMX-5 Bootloader

Windows USB Device Driver

In some cases updating the IMX-5 bootloader firmware (not the IMX-5 application firmware) will fail in Windows if the wrong device driver is used. The following instructions show how to install the correct device driver using the Zadig generic USB driver installer Windows application.

Steps to Update IMX Windows Device Driver

When updating the bootloader, the IMX-5 will switch into ROM bootloader mode and communicate using DFU protocol over USB. In this mode the device is identified in the Window Device Manager as STM32 BOOTLOADER. This device will only appear in the Device Manager when the IMX-5 is in ROM bootloader mode and connected via USB. This device will not appear in the Device Manager during normal operation or when not connected over USB.

STEP 1 - Uninstall Old Device Driver - To uninstall the device driver, right click and select "Uninstall device" on the STM32 BOOTLOADER device.

NOTE: To see the device in the device manager, the IMX-5 should be connected over USB and the IMX-5 in ROM bootloader mode. Run the firmware update with bootloader Force Update option to enable ROM bootloader mode on the IMX-5.

NOTE: An incorrect version of the device driver can be identified when the STM32 BOOTLOADER device appears under Universal Serial Bus Controllers. The correct device driver will cause the STM32 BOOTLOADER device to appear under Universal Serial Bus Devices.

Delete the old device driver files by selecting Attempt to remove the driver for this device or Delete driver files checkbox and click Uninstall.

STEP 2 - Install New Device Driver - Download and run the Zadig USB driver installer. The Zadig USB driver installer detects the device that needs the driver installed. The STM32 BOOTLOADER device must appear in the Windows Device Manager for this to work. When there is no device driver installed, the STM32 BOOTLOADER device will appear under Other devices in the Windows Device Manager.

Run the Zadig generic USB driver application. Select update online and make sure STM32 BOOTLOADER is selected in the top dropdown menu. WinUSB *=*v(6.1... should appear in the driver option list. Click Install Driver and wait about one minute for the process to finish.

The STM32 BOOTLOADER device will appear in the Device Manager under Universal Serial Bus devices when the device driver is properly installed.

Run the firmware update to test the newly installed device driver.

NOTE: The negotiation at the beginning of the IMX-5 bootloader update can be interrupted if the IMX-5 receives data on other ports than that used for the update (i.e. from a connected GPS receiver). If this happens, the firmware update will fail but can be re-run. To prevent interruption so that the bootloader update occurs in one process, data stream into other ports of the IMX must be turned off.