Bootloader could not connect error

If you receive a “Bootloader could not connect” error when updating your device, follow the steps below.

1. Make sure the device is connected to a USB 2.0 port. There are known issues when updating via a USB 3.0 port, particularly with certain driver versions.

2. Check your device has the correct drivers installed and selected. Leave the error message displayed, and open Device Manager. Look for a section called "Other devices". If you see one called "STM32 BOOTLOADER" or similar, with a yellow exclamation warning against it (as shown below), drivers are not correctly installed and configured.

The easiest way to fix this is to reinstall the Device Control software, ensuring that the driver installation checkbox is selected.selected:

 After reinstalling the software, retry the firmware update process. If thisyou doesn'tstill work,experience try manually settingissues, the drivers.drivers Themay be installed but it is possible an incorrect driver is selected for the device. Follow these instructions canto beresolve. found in the 'Wrong Driver selected error' section.

Wrong driver selected error.

If you receive a “Wrong driver selected” error when updating your device, follow the steps below.

 While the error message is displayed go to Windows device manager and find the device. It will be listed as STM Device in DFU Mode.

Right-click on the device > properties > update driver.

Select 'Browse my computer for drivers' > 'Let me pick from a list available drivers on my computer'. Select STM32 BOOTLOADER and click next. Restart your device and Device Control software and try to update again.

It should now appear as a STM32 BOOTLOADER device.

Restart your device and the Device control software and try updating the device again.