Unable to Flash nRF54L15 Using nRF52840 DK (J-Link OB) – Read Works but Programming Fails

[Pavanreddy0]

Hi,

I checked the information about nRF52840 DK versions supporting Cortex-M33 devices.

In my case, I am using an nRF52840 DK, but I am facing the following behavior:

• The debugger detects the nRF54L15 over SWD

• I am able to read the device ID

• However, flashing fails (erase/write does not work)

Could you please help clarify:

1. Does the J-Link OB on nRF52840 DK fully support flashing (erase/write) for nRF54L15, or is the support limited?

2. Are there any specific requirements such as:

   • Minimum DK version (v3.0.0 or later)?

   • Required J-Link firmware version?

   • Required nRF Connect SDK / tools version?

3. Is there any known limitation when using J-Link OB with nRF54L15 RRAM?

I want to confirm whether this setup is officially supported for programming, or if using an nRF54L15 DK / external J-Link is recommended.

Thanks!

[DanielNG]

Hi Pavanreddy0,

The nRF52840DK should be able to flash the nrf54L15DK

Minimum nRF52840DK version: v3.0.0 and newer can program Cortex M33 based nRF's (nRF53, nRF91, nRF54)
Required J-Link: You should get at least V8.16 but I recommend getting something new like v9.24a
SDK/tools: At least v2.9 but for the SDK but I recommend just using the latest version v3.2.4, nrfutil device should be v2.17.4 and newer.

Also you should use a short cable (<10 cm) 

Thank you