Power Profiler II Kit Connecting Forever / Doesn't Connect

RE: Power Profiler II Kit Connecting Forever / Doesn't Connect

DavidDettling — Fri, 10 Oct 2025 04:05:05 GMT

HI Dejan,

Great news! I was able to fix the issue and it works now.

After you had told me to check the COM ports 0 and 1 and saw that mine were 27 and 29 (I didn't find it strange that they were higher numbers), but I did think it strange that they weren't consecutive. Assumed that 28 must have already been taken somehow, but decided to see if this was the issue.

I did some reading on how to reset the COM numbers. I tried messing with the COM Port Arbiter in the Registry, but this just freed-up or changed the numbering (didn't impact the installed devices).

I had previously tried uninstalling the COM ports (and drivers) from the device manager while connected to the device and it didn't help anything (they came back with the same numbers).

I found a tip that you can enable hidden devices in the device manager. This let me see all the COM ports including the PPKs while not connected to it. I uninstalled 27, 28 and 29 and then reconnected. I noticed the COM ports changed from 27 and 29 to 27 and 28. However, it still didn't work.

I then realized when scanning down the list that COM27 was in the list twice. No idea how this happened, but removed both 27s and 28 again and reconnected and now it works!

Thanks for you help and sticking with this.

RE: Power Profiler II Kit Connecting Forever / Doesn't Connect

DavidDettling — Wed, 08 Oct 2025 16:04:52 GMT

Hi Dejan,

I enabled verbose logging. Here is the log:

10:48:07.359  Initialising the bundled nrfutil device
10:48:07.625  Using the bundled core version for nrfutil device: 8.0.0
10:48:07.642  [PID:16320] nrfutil-device (version = 2.10.2, platform = x86_64-pc-windows-msvc, classification = nrf-external) invoked with list --traits nordicUsb,nordicDfu,serialPorts,jlink --hotplug --json --log-output=stdout --log-level trace
10:48:07.649  [PID:16320] [ProbeLib] [2025-10-08 15:48:07.649108Z] Opened J-Link DLL at C:\Program Files\SEGGER\JLink\JLink_x64.dll with version 8.18
10:48:07.672  Using nrfutil-device version: 2.10.2
10:48:07.672  Using nrf-device-lib version: 0.17.71
10:48:07.673  Using nrf-probe version: 0.38.0
10:48:07.673  Using JLink version: JLink_V8.18
10:48:07.712  [PID:16320] [ProbeLib] [2025-10-08 15:48:07.712294Z] Opened J-Link DLL at C:\Program Files\SEGGER\JLink\JLink_x64.dll with version 8.18
10:48:07.715  [PID:16320] [ProbeLib] [2025-10-08 15:48:07.715376Z] Found 0 attached J-Link devices
10:48:34.160  [PID:16320] [ProbeLib] [2025-10-08 15:48:34.160507Z] Opened J-Link DLL at C:\Program Files\SEGGER\JLink\JLink_x64.dll with version 8.18
10:48:34.162  [PID:16320] [ProbeLib] [2025-10-08 15:48:34.162507Z] Found 0 attached J-Link devices
10:48:34.513  Getting serial port options from the persistent store for F00CD018F83F.pc-nrfconnect-ppk
10:48:34.515  Device connected with the serial number F00CD018F83F
10:48:34.601  [PID:16320] [ProbeLib] [2025-10-08 15:48:34.600383Z] Opened J-Link DLL at C:\Program Files\SEGGER\JLink\JLink_x64.dll with version 8.18
10:48:34.603  [PID:16320] [ProbeLib] [2025-10-08 15:48:34.603464Z] Found 0 attached J-Link devices
10:48:34.846  Getting serial port options from the persistent store for F00CD018F83F.pc-nrfconnect-ppk
10:48:34.935  [PID:16320] [ProbeLib] [2025-10-08 15:48:34.934873Z] Opened J-Link DLL at C:\Program Files\SEGGER\JLink\JLink_x64.dll with version 8.18
10:48:34.939  [PID:16320] [ProbeLib] [2025-10-08 15:48:34.939030Z] Found 0 attached J-Link devices
10:48:35.190  Getting serial port options from the persistent store for F00CD018F83F.pc-nrfconnect-ppk
10:48:44.386  Selecting device with the serial number F00CD018F83F
10:48:44.485  [PID:10444] nrfutil-device (version = 2.10.2, platform = x86_64-pc-windows-msvc, classification = nrf-external) invoked with device-info --serial-number F00CD018F83F --json --log-output=stdout --log-level trace
10:48:44.495  [PID:10444] [ProbeLib] [2025-10-08 15:48:44.495511Z] Opened J-Link DLL at C:\Program Files\SEGGER\JLink\JLink_x64.dll with version 8.18
10:48:44.569  [PID:10444] [ProbeLib] [2025-10-08 15:48:44.568457Z] Opened J-Link DLL at C:\Program Files\SEGGER\JLink\JLink_x64.dll with version 8.18
10:48:44.572  [PID:10444] [ProbeLib] [2025-10-08 15:48:44.572043Z] Found 0 attached J-Link devices
10:48:44.972  Selected device with the serial number F00CD018F83F
10:48:44.974  Connected to the device with the serial number F00CD018F83F and family: Unknown

When I connect via serial port, I don't have VCOM0 and VCOM1. I have VCOM27 and VCOM29. I assuming this is ok as the COM ports just increment as new devices are used.
I can connect to the Serial Terminal, and once connected I can change from VCOM27 to VCOM29. VCOM29 comes up with the shell. Pictures below.

RE: Power Profiler II Kit Connecting Forever / Doesn't Connect

dejans — Wed, 08 Oct 2025 13:51:14 GMT

Hi,

Can you please enable Verbose logging in the Power Profiler application (About -> Verbose Logging) and share the log?

Additionally, PPK VCOM0 is used for PPK data and VCOM1 for debug shell. Can you check and verify that VCOM1 is used as Zephyr shell by connecting to it using Serial Terminal and observing shell prompt 'shell:~$' ?

Best regards,
Dejan

RE: Power Profiler II Kit Connecting Forever / Doesn't Connect

DavidDettling — Tue, 07 Oct 2025 22:28:12 GMT

Hi Dejan,

Thanks for continuing to follow up.
I have and have had only the one PPKII unit.

Here is a photo of the sticker on it, the version and date code on it match the sticker on the box:
PCA63100
1.1.0
2023.17

RE: Power Profiler II Kit Connecting Forever / Doesn't Connect

dejans — Tue, 07 Oct 2025 07:35:17 GMT

Hi,

Thank you for additional information.

Which version of the PPK II do you use?
Have you tried to use any other (possibly older) version of PPK II? Is your issue reproducible on this board?

Best regards,
Dejan

RE: Power Profiler II Kit Connecting Forever / Doesn't Connect

DavidDettling — Mon, 06 Oct 2025 15:03:48 GMT

Hi Dejan,

Yes, I have tried older versions of Power Profiler App.
I tried the current v4.31. I also tried v4.3.0 and v4.0.0. You can't go back farther than v4.0.0 without also rolling back the Desktop App. If you think there is a specific version I should try, let me know.

Here is the output of nrfutil device list:

F00CD018F83F
Product PPK2
Ports COM27, vcom: 0
COM29, vcom: 1
Traits serialPorts, usb, nordicDfu, nordicUsb

Supported devices found: 1

RE: Power Profiler II Kit Connecting Forever / Doesn't Connect

dejans — Mon, 06 Oct 2025 08:59:40 GMT

Hi David,

Have you tried to downgrade your Power Profiler app?

Can you provide the output when you run "nrfutil device list"?

Best regards,
Dejan

RE: Power Profiler II Kit Connecting Forever / Doesn't Connect

DavidDettling — Fri, 03 Oct 2025 16:40:02 GMT

Hi Dejan.

Yes v8.18 of Segger J-Link was tried first, as can be seen in the first of the two logs posted. I updated to v8.74 (2nd log) to see if it would make any difference and it didn't.

I again tried uninstalling all versions of Segger J-Link and all Nordic Tools and just reinstalling only nRF Connect Desktop, and I'm still seeing the same issue.

I went back to the PC where this is work. I verified:
- Same nRF Connect for Desktop Version (v5.2.0)
- Same Segger J-Link version (v8.18)
- Same Devices showing up in the device manager and same versions for those devices.
- LED is flashing green in the same manner before connecting.

Here is the log for the working PC using the same PPK2 and same USB cable:
11:31:39.368 Initialising the bundled nrfutil device
11:31:39.778 Using the bundled core version for nrfutil device: 8.0.0
11:31:39.839 Using nrfutil-device version: 2.10.2
11:31:39.839 Using nrf-device-lib version: 0.17.71
11:31:39.839 Using nrf-probe version: 0.38.0
11:31:39.839 Using JLink version: JLink_V8.18
11:31:45.785 Getting serial port options from the persistent store for F00CD018F83F.pc-nrfconnect-ppk
11:31:45.787 Device connected with the serial number F00CD018F83F
11:31:45.821 Getting serial port options from the persistent store for F00CD018F83F.pc-nrfconnect-ppk
11:31:45.850 Getting serial port options from the persistent store for F00CD018F83F.pc-nrfconnect-ppk
11:31:49.843 Selecting device with the serial number F00CD018F83F
11:31:50.098 Selected device with the serial number F00CD018F83F
11:31:50.100 Connected to the device with the serial number F00CD018F83F and family: Unknown
11:31:50.463 PPK started
11:31:50.464 PPK opened

It's looks to be the same as the failing PC until the last two lines that never happen.

Is there any other logging information that could be looked at?

David

RE: Power Profiler II Kit Connecting Forever / Doesn't Connect

dejans — Fri, 03 Oct 2025 07:55:13 GMT

Hi,

[quote user="DavidDettling"]Your version of SEGGER J-Link (8.74) is newer than the one this app was tested with (8.18).[/quote]

Have you tried to downgrade to mentioned tested version of SEGGER J-Link?

Best regards,
Dejan

RE: Power Profiler II Kit Connecting Forever / Doesn't Connect

DavidDettling — Thu, 02 Oct 2025 15:38:16 GMT

Hi Dejan,

Thanks for your response.

Yes, I did get that message when I first connected my device. The FW update completed successfully, but it did not connect after rebooting itself. After removing and reconnecting the device is still does not connect, and it no longer asks for the FW to be updated. The device did work on another PC after FW update, so I assumed the update was successful.

I tried multiple USB cables and multiple ports, and used the same USB cable on the other PC where the connection worked.

The other device in the the log was a Segger JTAG that was connected. I disconnected it, but I still don't get a connection in the PPK2. Here is the log without the other device:

10:25:41.774

Initialising the bundled nrfutil device

10:25:42.050

Using the bundled core version for nrfutil device: 8.0.0

10:25:42.091

Using nrfutil-device version: 2.10.2

10:25:42.091

Using nrf-device-lib version: 0.17.71

10:25:42.091

Using nrf-probe version: 0.38.0

10:25:42.091

Using JLink version: JLink_V8.74

10:25:42.092

Your version of SEGGER J-Link (8.74) is newer than the one this app was tested with (8.18). The tested version is not required, and your J-Link version will most likely work fine. If you get issues related to J-Link with your devices, use the tested version.

10:25:52.024

Getting serial port options from the persistent store for F00CD018F83F.pc-nrfconnect-ppk

10:25:52.025

Device connected with the serial number F00CD018F83F

10:25:52.344

Getting serial port options from the persistent store for F00CD018F83F.pc-nrfconnect-ppk

10:25:52.662

Getting serial port options from the persistent store for F00CD018F83F.pc-nrfconnect-ppk

10:25:57.833

Selecting device with the serial number F00CD018F83F

10:25:58.400

Selected device with the serial number F00CD018F83F

10:25:58.401

Connected to the device with the serial number F00CD018F83F and family: Unknown

Thanks for the info on direct programming. I was able to do that. My file name was:
pca63100_ppk2_1.2.4_db16a94.hex

It said it completed successfully in 9 seconds. I rebooted the PPK2 and tried the Power Profiler app again, but I still get the same thing. It just says connecting forever with the green LED slowly flashing...

Any other ideas?
Thanks again.

RE: Power Profiler II Kit Connecting Forever / Doesn't Connect

dejans — Thu, 02 Oct 2025 06:52:16 GMT

Hi,

[quote user=""]When first connecting the kit it came up and asked me to update the FW, which completed successfully.[/quote]

Did you get the message shown below when you tried to connect to your PPK II?

I assume you chose Program instead of No. Is this correct?

Have you been presented with the same pop-up window after FW update was completed and you disconnected and then reconnected your PPK II?

Did you have 2 devices (F00CD018F83F and 000519002569) connected initially? What was the second device?

It might be that your firmware update got interrupted. You could try to change USB cable and/or USB port or program firmware manually using Programmer application. You could look at this ticket for more information on how this problem could be resolved.

Best regards,
Dejan

RE: Power Profiler II Kit Connecting Forever / Doesn't Connect

DavidDettling — Wed, 01 Oct 2025 18:02:54 GMT

It's Windows 11 PC.

Also tried rebooting PC and attempting with a clean boot with nothing else running.

And tried removing all other USB connections to the PC except for the PPKII.

Still same issue.