Bricked PCA10056 nrf52840 DK

[cheston2]

I have recently bought two nrf52840dk, version 3.0.0, unboxed and plugged into usb. One would show up with a usb storage on the side and in vscode a J-link window prompted for a device update on the interface nrf5340 chip on the dk, but the other one doesn't have either. How can I factory reset the non working one? Here are some logs to show.

lsusb:

Working one:

Bus 003 Device 045: ID 1366:1061 SEGGER J-Link

Non working one:

Bus 003 Device 056: ID 1366:0101 SEGGER J-Link PLUS

dmesg messages:

Working one:

usb 3-1: new full-speed USB device number 21 using xhci_hcd

usb 3-1: New USB device found, idVendor=1366, idProduct=1051, bcdDevice= 1.00

usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3

usb 3-1: Product: J-Link

usb 3-1: Manufacturer: SEGGER

usb 3-1: SerialNumber: 001050220349

cdc_acm 3-1:1.0: ttyACM0: USB ACM device

cdc_acm 3-1:1.2: ttyACM1: USB ACM device

usb-storage 3-1:1.5: USB Mass Storage device detected

scsi host0: usb-storage 3-1:1.5

scsi 0:0:0:0: Direct-Access SEGGER MSD Volume 1.00 PQ: 0 ANSI: 4

sd 0:0:0:0: Attached scsi generic sg0 type 0

sd 0:0:0:0: [sda] 21829 512-byte logical blocks: (11.2 MB/10.7 MiB)

sd 0:0:0:0: [sda] Write Protect is off

sd 0:0:0:0: [sda] Mode Sense: 0b 00 00 08

sd 0:0:0:0: [sda] No Caching mode page found

sd 0:0:0:0: [sda] Assuming drive cache: write through

sda:

sd 0:0:0:0: [sda] Attached SCSI removable disk

usb 3-1: USB disconnect, device number 21

umount: attempt to access beyond end of device

sda: rw=0, sector=0, nr_sectors = 1 limit=0

FAT-fs (sda): unable to read boot sector to mark fs as dirty

Non working one:

usb 3-1: new full-speed USB device number 23 using xhci_hcd

usb 3-1: New USB device found, idVendor=1366, idProduct=0101, bcdDevice= 1.00

usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3

usb 3-1: Product: J-Link

usb 3-1: Manufacturer: SEGGER

usb 3-1: SerialNumber: 001050261048

usb 3-1: USB disconnect, device number 23

VSCode nrf connect extension

Working one:

Non-working one:

[Sigurd Hellesvik]

Hi,

We have two versions of the On-Board debugger. One with the sticker on the chip (the old one), and one with the sticker directly on the PCB (The new version).

This will work for the new version, which should be the one that you got:

Hold the reset button while plugging in the USB of the DK. You will see no change, but the On-Board Debugger should now be in recovery mode.

Run "nrfutil device x-update-debug-probe-firmware"

This should update the firmware on the On-Board Debugger. So if it is a software problem, then this should fix it.

Regards,
Sigurd Hellesvik

[cheston2]

3.0.0 is the newer version. Holding reset button doesn't really work. What else could I do?

```
$ lsusb
Bus 003 Device 010: ID 1366:0101 SEGGER J-Link PLUS
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
$ nrfutil device x-update-debug-probe-firmware
Error: One or more update debug probe firmware tasks failed:
 * 1050261048: Timed out waiting for response from worker. (Generic)

```

[Sigurd Hellesvik]

Does the LED next to the interface chip light up on both DKs the same?

[cheston2]

They turned on exactly the same way

[cheston2]

It can't even be connected...
$ nrfutil device recover
 Failed to recover 1050261048, Timed out waiting for response from worker.
Error: One or more recover tasks failed:
 * 1050261048: Timed out waiting for response from worker. (Generic)

$ nrfutil device recover
 Failed to recover 1050261048, Timed out waiting for response from worker.
Error: One or more recover tasks failed:
 * 1050261048: Timed out waiting for response from worker. (Generic)

$ nrfutil device erase
 Failed to erase 1050261048, Timed out waiting for response from worker.
Error: One or more erase tasks failed:
 * 1050261048: Timed out waiting for response from worker. (Generic)

$ lsusb
...
Bus 003 Device 027: ID 1366:0101 SEGGER J-Link PLUS
...

[Sigurd Hellesvik]

In this case, it looks like you have received a defect Developement Kit.

Can you try to contact the supplier from where you got it and get a replacement?