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I've bought the STM32L0538-Discovery board and I've successfully implemented the DFU-Standalone example. I've attached some pictures of the error message, driver version, and. My firmware is almost the same as an example for 32L0538DISCOVERY inside Cube L0 repository, and I'm using the latest version of L0 Cube firmware (V1.11.2). I've tried different solutions, running DfuSe from STM32L folder, but nothing helped. When Upgrade button is pressed inside DfuSe demo.The problem appears in the following moments: Windows does not complain about the driver when the USB is plugged in, when I try to update it, it says that I'm already using the newest version. It's not deterministic, I've succeeded couple of times to write my firmware via DfuSe, and successfully run the main program, but in most cases it fails. I've done many bootloader standalone firmwares for STM32 MCUs, for F0, F1, F3, F4 series, and had never encountered this kind of a problem. I have gone into device manager and uninstalled everything in USB controllers, although they reinstall on start up but at least I get to reinstall the STM 32 DFU after I've done that.I'm using STM32L072KZT6 microcontroller, and I'm trying to make USB DFU Standalone bootloader. On my laptop there are no other USB devices connected. I have tried it on six USB ports on two computers. The computer sees it as a USB device, but that's as much acknowledgement as there is.nothing in DfuSE, no change in the screen on the 7E (just shows "Program Update." and a little window half filled with vertical lines. Under My Computer STM 32 DFU never shows up as a device with removable storage, although that's perhaps because it's still with the original FW.
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Under "Safely Remove Hardware and Eject Media" I can remove the STM 32 DFU, at which time it goes away in Device Manager. In Device Manager, under USB DEVICES, I have STM 32 DFU. Nothing appears in the DfuSe "Available DFU Devices" dropdown list. I click the "details" bubble, and find "Driver software installation STM 32 DFU Installed, STM 32 DFU Ready to Use" When I turn on the 7E holding the EXT button, Windows 7 informs me that it is installing device driver software. I downloaded and installed DfuSe from the Walkera website, it opens nicely. I got a 7E for Christmas,and there has been no joy whatever. Normaly at this point windows should install drivers at this point and after that your devo is shown in your dfuse program. I guess this is the point were things go wrong in your case. Hold ext button and power up transmitter. TomPeer wrote: i asume you have done all this, but doing a resume: