Problems when updating firmware for Thingy:52 (and some instructions I find unclear)

Question

Hello, I am currently trying to update the firmware for Thingy 52, using the NRF52 development kit. 
 I am following the instructions in this section: 
 https://nordicsemiconductor.github.io/Nordic-Thingy52-FW/documentation/dfu_generating.html 
 Right now I'm very stuck. I have generated the private and public keys, and generated the DFU package for the application. I then need to compile the bootloader. What files (entire build or just the hex, out or bin files?) from the bootloader do I need to include in the package, and when I flash the Thingy? 
 Do I need to compile the softdevice, or just use the hex-file in "sdk_components\softdevice\s132\hex"? 
 The link to generating the bootloader settings seems to be broken: 
 http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.tools/dita/tools/nrfutil/nrfutil_settings_generate_display.html 
 
 Having then compiled all the needed elements, how do I combine these into a single package for the DFU? 
 Using the NRF52 DK and following the instructions, I tried updating by only uploading the DFU package for the application, and got the following errors: 
 " 
 C:\Users\Owner\Downloads>nrfutil_.exe dfu ble -ic NRF52 -pkg dfu-app.zip No target selected. Default device name: DfuTarg is used. Please select connectivity serial port: 0 : COM3 - 682293664 Enter your choice: : 0 
 Traceback (most recent call last): File "nordicsemi\__main__.py", line 1464, in <module> File "click\core.py", line 764, in __call__ File "click\core.py", line 717, in main File "click\core.py", line 1137, in invoke File "click\core.py", line 1137, in invoke File "click\core.py", line 956, in invoke File "click\core.py", line 555, in invoke File "nordicsemi\__main__.py", line 1151, in ble File "nordicsemi\dfu\dfu.py", line 129, in dfu_send_images File "nordicsemi\dfu\dfu.py", line 90, in _dfu_send_image File "nordicsemi\dfu\dfu_transport_ble.py", line 453, in open File "nordicsemi\dfu\dfu_transport_ble.py", line 106, in open File "site-packages\pc_ble_driver_py\ble_driver.py", line 127, in wrapper pc_ble_driver_py.exceptions.NordicSemiException: Failed to open. Error code: 13 [25572] Failed to execute script __main__ 
 
 Best regards, 
 Tobias Samuelsson