nrf5340 can not flash

RE: nrf5340 can not flash

Neo Yang — Wed, 29 Oct 2025 09:47:50 GMT

The problem has been solved. The nRF5340 hardware is designed to operate in the LDO power supply mode (that is, no necessary external components such as inductors are configured for the DCDC mode), but the burned-in program enabled the DCDC mode, causing the chip to fail to start properly and thus preventing it from being re-burned with other programs. The solution is to briefly supply power to the DECD pin to VDD, allowing the chip to temporarily recover. Then, re-burn the firmware that disables DCDC, and the board can be restored.

RE: nrf5340 can not flash

LL01 — Wed, 29 Oct 2025 09:18:09 GMT

Hello, have you resolved this issue? I'm facing the same problem where the circuit board cannot be programmed again after the first successful burn.

RE: nrf5340 can not flash

Neo Yang — Mon, 27 Oct 2025 09:00:09 GMT

You've tried everything you said, but it still didn't work.

RE: nrf5340 can not flash

onserious — Mon, 27 Oct 2025 08:17:27 GMT

If that fails, you might also need to power cycle the escape road board and ensure the reset pin is properly connected.

RE: nrf5340 can not flash

onserious — Mon, 27 Oct 2025 08:16:34 GMT

Hey Neo,

Check your voltage levels and connections first — if the SWD lines aren’t clean or stable, the chip won’t respond. Then try running nrfjprog --eraseall -f NRF53 before recovery.