Resolved! STM32L052K8 custom board does not run while the same board for STM32F051K8 works (same pinout and peripherals on the PCB)
Updated Question:I have a custom PCB board with L052K8 and F051K8 with the same peripherals and correct hardware design for each (F051K8 has a VSSA for the ADC and different bypass cap), but only the L051K8 is able to program its firmware and reset c...