Jlink Interface Firmware download

Hi there,

due to unknown reasons, my nrf52840-DK (1.0.0) didn't come back up after flashing software to it. Means the LED that usually turns on when you power it up remains off. I started the board in "flash interface firmware" mode which works but I can't find the JLINK firmware on either Nordic or Segger websites. I'm pretty sure it was available for the older nrf51-dk. 

I flashed mbed's dap-link but that, of course, doesn't work together with the NRF Connect Programmer. Anybody who could post the link to the interface firmware here? 

Ah - update through J-Link configurator doesn't work either as a Jlink firmware needs to be working in the first place. Couldn't spot the firmware in the Windows Jlink Directory either.

Thanks,

Jens