/hkx/ Injection Question

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Haven't played since last year, trying to set up my DS to do injections again but running into an issue. I'm following the guide in https://pastebin.com/Ps6EEPx6 and have placed the file 0004000000175e00.bin into a folder named /luma/code_sections. I have not renamed this file and I have deleted my previous code.bin that was stored in /luma/titles/0004000000175E00. The game starts, but injection via both the ingame scanner and the web browser QR scanner doesn't work. Attempting to use the home button -> qr scan yields the error 'The internet browser will become available once you update your system via the internet', yet I've attempted to update multiple times with no results.
I'm sure I'm missing something obvious here, and I need to do this somewhat urgently.