restoring NRF52840 dongle bootloader

Hi

I compiled an older project using embedded studio and flashed my NRF dongle. Now the USB DFU bootloader seems to be gone.

How can I restore it?

Several links on devzone take me here:

devzone.nordicsemi.com/.../nrf52840-dongle-programming-tutorial

How ever there are some broken links.

On some other posts on devzone people mention I need this file: graviton_bootloader_mbr_v1.0.1-\[nRF5_SDK_15.0.1-1.alpha_f76d012\].hex

Where do I get it?

I have a segger to program my dongle!

Thx

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