FEDEVEL
Platform forum

SergenX , 04-17-2026, 07:36 AM

Hello I designed a SoM board for my system but I
faced some problems
I can’t see DFU on the stm32cubeprogrammer also I pulled down to gnd all boot pins.

I dont programmed the stpmic25 its could be? or diffirent.

My schematics

Robert Feranec , 04-17-2026, 08:26 AM

some STM have a fuse that needs to be set to use the pin to be able to go into DFU. Have a look at nBOOT_SEL

SergenX , 04-17-2026, 09:25 AM

Thanks for your comment 🙏 I will check it

SergenX , 04-17-2026, 11:27 AM

I didn’t see nBoot_sel in the datasheet also I comparated discovery board and my som board the my board nrst ,pwr on and pwr cpu on pins always stay 0 ı pulled up to 3.3v with 10k resistor but doesn’t change anything

Robert Feranec , 04-20-2026, 06:13 AM

use STM32CubeProgrammer to check the status of the bit

Robert Feranec , 04-20-2026, 06:14 AM

I don't know why it stays 0 there may be multiple reasons

SergenX , 04-23-2026, 05:57 AM

Hello , I resoldered the MPU now the usb coming on the device manager but its gives code 43 USB Device Not Recognized error I will try with stlink v3 thank you so much for your support.