Arduino for STM32

I have made Custom board with Simple ST-Link v2 pins out 34/37 and power. Program does gets loaded using Arduino STM32 Core and SL-Link v2 Successfully shows download and led indicates accordingly.

But 7 Segment doesn't light up.

Same Hardware if i program through non STM32 Core and program via UART. Everything is running smooth.

I am afraid there's no hardware change and still ST Link Programming method doesn't work.

what could be wrong ?

Don't remember if serial does verification but upload by stlink does verification, so if you don't got any error on the stlink upload everything was right with the MCU, so the problem is somewhere else, without posting an schematic are just guesses:

- Boot pins is it configured right?... to boot from flash.
- Is your code right?.
- Is there a pinout connection/short problem with the segmented leds or IC in between?