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nucleo firmware update problem

07 Nov 2014

hello, I bought two nucleo F401RE, MB1136 rev C. I run Windows XP sp3. On first one I upgraded the firmare to version v2j23m6 with STW-LINK007, apparently with success (no errors in Windows Device Manager, ST-Link Utility recognizes the device and shows the firmware version). But virtual com port is not working (nucleo_printf online compiler example program). I also tried serial UART 1 and 6 with an external uart-usb adapter, with no success. On the other hand, the second board, which I did not updated, works fine. St-link utility reports firmware v2j19m3 on it. I couldn't find that firmware on site site; I found STSW-link005 with v2j21m5, and also St-link utility makes update to that, but with this update the situation is unchanged. How can I revert to the old firmware? or what can I do? Thank you in advance, and please forgive me for my shaky english. Paolo

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