Can't flash custom board via nRF52840DK in VS Code

Good Day.

I have two identical custom boards that I want to flash the Blinky example into.

The strange thing is that both boards are flashed without problems (writes that the flash was successful) via VS Code, but on one board the LED blinks and on the other board it doesn't (the pin is constantly 1.4V). But when I flash both boards in Segger Embedded Studio, both work without problems and the LEDs blink.

It means that the circuit is correct (all pins are in order) and the programmer is in good working order.

But then what could be the problem?

Perhaps someone has encountered a similar problem?

Thanks. 

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