Firmware Upgradation through USB

[saiteja]

we are using STM32F407 controller in our project. In this we have taken an option of firmware upgradation through USB. Everything is fine and works good but for some controllers USB is recognising directly and for some it is recognising if there is only an internet connection. why it is happening like this? what might be the issue? How to resolve it?

[Tesla DeLorean]

Sorry don't really understand the context here.

The STM32 board has a connection to the Internet?

Or the Windows PC? Which is presumably trying to fetch a driver. Try installing the drivers first.​

[saiteja]

Internet connection for Windows PC..... Even though updating the driver, if we try to update firmware without internet to the PC it is not recognising if we connect Internet to the PC immediately it is recognising and Firmware is upgrading. It is happening only for 2 out of 10 controllers remaining are recognising directly without Internet.

[Tesla DeLorean]

Does your USB implementation report a serial number?

What application are you using to do the update?

For the problem devices, what details are reported in Device Manager?​

[saiteja]

Application iam using to update is 'DfuseDemo'. For problem devices it is showing STM drivers not recognised.