RE: Can't flash PCA10040

Jonas0 — Tue, 19 May 2026 20:04:02 GMT

Herer is the output, I also executed "nrfutil self-upgrade":

C:\Program Files\Nordic Semiconductor\nrf-command-line-tools\bin>nrfutil upgrade
Downloading nrfutil-ble-sniffer-x86_64-pc-windows-msvc-0.19.0
Verifying nrfutil-ble-sniffer-x86_64-pc-windows-msvc-0.19.0
Updating nrfutil-ble-sniffer to 0.19.0
nrfutil-completion is already the newest version (1.5.0)
Downloading nrfutil-device-x86_64-pc-windows-msvc-2.18.2
Verifying nrfutil-device-x86_64-pc-windows-msvc-2.18.2
Updating nrfutil-device to 2.18.2
[00:00:05] ###### 100% [Upgrade packages] Upgrade packages
A new version of nrfutil is available. Please run: nrfutil self-upgrade

C:\Program Files\Nordic Semiconductor\nrf-command-line-tools\bin>nrfutil device recover
x Failed to recover 1050340818, Device error: Access port is still protected after Erase and Reset Error: One or more recover tasks failed:
* 1050340818: Device error: Access port is still protected after Erase and Reset (Generic)

C:\Program Files\Nordic Semiconductor\nrf-command-line-tools\bin>nrfutil self-upgrade
Uninstalled nrfutil
[00:00:03] ###### 100% [Install packages] Install packages
C:\Program Files\Nordic Semiconductor\nrf-command-line-tools\bin>nrfutil device recover
x Failed to recover 1050340818, Device error: Access port is still protected after Erase and Reset Error: One or more recover tasks failed:
* 1050340818: Device error: Access port is still protected after Erase and Reset (Generic)

C:\Program Files\Nordic Semiconductor\nrf-command-line-tools\bin>

RE: Can't flash PCA10040

Amanda Hsieh — Tue, 19 May 2026 19:49:38 GMT

Could you execute "nrfutil upgrade" and then try again?

RE: Can't flash PCA10040

Jonas0 — Tue, 19 May 2026 19:01:23 GMT

Hi,
I tried but got this:

C:\Program Files\Nordic Semiconductor\nrf-command-line-tools\bin>nrfutil device recover
❌ Failed to recover 1050340818, Device error: Access port is still protected after Erase and Reset Error: One or more recover tasks failed:
* 1050340818: Device error: Access port is still protected after Erase and Reset (Generic)

C:\Program Files\Nordic Semiconductor\nrf-command-line-tools\bin>

RE: Can't flash PCA10040

Amanda Hsieh — Tue, 19 May 2026 18:46:16 GMT

Hi,

nRF Command Line Tools (nrfjprog) is deprecated and replaced by nRF Util. Please install nRF Util and run "nrfutil install device" to install the device command. Then, you can execute "nrfutil device recover" to recover (unlock) the device.

Regards,
Amanda H.