I have a custom board with a STM32F3.
To update the firmware i have to hold on Reset and push on boot to be on dfu mode.
A freelancer has modified the firmware , i sent a code, can enter in DFU mode update the firmware but there is some bug.
For example if i shutdown my board and my computer, if i power on the mainboard(board with stm32) and my computer , the mainboard don't start(led and fan don't start) and buzzer make sound.
It seems to be because Usb of my computer is switch off.
When the mainboard is connected to my PC who is power on, the buzzer stop.
I search an expert in STM32 who use Keil V5 and can fix this problem.
My budget is 70usd.