Hi,
I think that you have 2 mistakes in your tuto (please confirm or correct me if i am wrong )
In https://dsi.cfw.guide/installing-hiyacfw
the steps in "Finalization" section are :
- Copy the contents of the HiyaCFW for SDNAND SD card folder to the root of your SD card
- If asked to replace any files, do so
- Open the Modified Files folder from the HiyaCFW for PC folder
- Copy bootloader.nds to the hiya folder on your SD card
- Copy 00000002.app to title -> 00030017 -> 484e41XX -> content folder on your SD card
- XX denotes your region: 45 for USA, 50 for EUR, 4A for JAP, 55 for AUS
- Unplug your SD card, and insert it in your DSi
- Power on your console
- HiyaCFW’s settings screen should appear
So I gess that the mistakes in your Tuto are:
The 1st ) bootloader.nds to the hiya folder on your SD card (instead of SD card root directory in your tuto)
The 2nd) copy 00000002.app to title -> 00030017 -> 484e41XX with XX = 50 for urope (instead of 56 in your tuto)
Do you confirm that ?
(I tried that, but I allways have the black screen when I try to boot from the SD card after hiya installation