DFUMODE nucleo L152Re not blink led ld2HELP !!!!!!!!!!!!

[bfran.1]

I followed the steps of the example:

I flashed the microcontroller L152RE of Nucleo with cable USB CN2 and then I connected the usb cable, I chose the .dfu application in binary folder, I did the upgrade and then I pressed reset, I don't see the LD2 led blink.

YOU CAN HELP ME I HAVE ALREADY BEEN 2 DAYS GOING CRAZY.

Thanks

[Tesla DeLorean]

Dupe https://community.st.com/s/question/0D53W00000N9VPkSAN/stm32l152-nucleo-dfu-mode-example-not-run-