I'm following Plailect's guide, and I'm up to Section II - Installing arm9loaderhax, Step 2. I'm using a USA New 3DS XL on 2.1.0, and I insert my SD right after booting into the HOME Menu. I open the internet browser, tap 'URL', and type in 'http://2xrsa.3ds.guide'. It loads for a bit before the bottom screen flickers once, and the clock on the top screen stops moving shortly afterwards. I've heard of pressing Select once or twice, but nothing happened. I've also heard of initializing save data - likewise, same results.
Here's my SD root: http://imgur.com/a/V6QFL
Here's my SD root: http://imgur.com/a/V6QFL