nRF52840 PDK programming trouble

Question

Hi,
I have serious troubles when trying to program the board with softdevice (s140). 
 
 nRFGo Studio:
nRFGo Studio installed and running fine. When I connected the board I received a notification to update jlink firmware. Update procedure ended with a board which is not programmable . I got the following error message: No device detected or readback protection may be set. I haven't found any info about that on PDK user guide. I tried the recovery procedure without any results. The nRF5x programming link is always grayed. 
 GCC makefile:
where is the 'flash_softdevice' file called by 'make flash_softdevice' I cannot find it. 
 
 Hope to have not bricked the board.
Anybody could help? 
 thanks in advance
F

Roger Clark · Accepted Answer

Did you try connecting using JFlash ? 
 If the nRFGo Studio didn't install the Segger tools you can download them directly from Seggers site. 
 Note.
I found J-Flash will not write to the flash in these Nordic dev boards, but you should be able to connect and read the flash using JFlash 
 And JLink Commander is fully functional, so you could try that as well. 
 BTW. I received my nRF52840 PDK about a week ago, and I also did the firmware upgrade, but the upgrade was via JFlash not nRFGo. (though its likely to be the same firmware package) 
 And the update did not brick the board. 
 What confused me is that J-Flash will not write to the flash (you get a license error message) 
 But Keil etc can write to the flash (upload the app) using J-Link, so the underlying processes work fine its just the JFlash GUI that does not fully work with the PDK (and other Nordic eval boards)