Here's exactly what I did (this worked for me but again this may be pure luck):Hm I am out of luck. After booting I have again black screen. Did you include anything else?
I have included all the files in the video, together with my prod.keys, I am injecting fusee, it boots, shows logo and then black screen
1. Extracted atmosphere-0.9.4-master-a750e55f+hbl-2.2+hbmenu-3.1.1.zip to the root of the SD Card
2. Extracted 2.0.0-9.0.0 (4).zip onto the root of the SD card (overwriting existing files in case you are asked to)
3. Copied prod.keys file to sdcard\switch folder
4. Extracted hbgshop_aio_4.1.0.zip file to the root of the SD Card (replace all existing files if prompted to do so)
5. Copied the NX-8.1.0 folder (this folder holds the nca files for the firmware) to the Switch folder (sdcard\switch\NX-8.1.0)
6. Place the sd card back into the Switch, slide the dongle in
7. Launch TegraRcmGUI.exe and boot up your Switch (Power + Vol up)
8. Once the Switch has booted, went to Album, selected Choidujour, browsed to the NX-8.1.0 folder and selected it from the menu
9. Completed the installation from there
10. Back to home menu on the Switch, Turned off console (hold power button for a few seconds, select turn off from menu)
11. Copied boot.dat from SX OS 2.8 zip file to the root of the SD Card (removed all previously installed stuff from step 1)
12. I only make sure I have tinfoil.nro ; sx.nro ; ChoiDujourNX.nro on the Switch folder)
13. SD Card back into the Switch (dongle and SX bottom device), booted using Power + Vol up
14. Working as expected again (FW 8.1.0)
15. Waiting for a fix for 9.0.0...
Good luck to you, but if possible check with other more knowledgeable people, I really got lucky I guess.