If you can't use browserhax after a few tries, it's probably a partial downgrade and you should downgrade again.
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Yep that's right. Here's a link for 1.4.17:
https://github.com/Steveice10/FBI/releases/tag/1.4.17
The Plailect guide will tell you how to inject using Decrypt9, I think it's at the bottom of Part 3 but not certain. Basically, boot into Decrypt9 and go to miscellaneous I think, then dump health & safety, naming it hs.app. Download the injecting files from Plailect's guide and put hs.app and fbi.cia in the input folder and double click go.bat. Then put the FBI_with_banner.app in the root of your SD and boot into Decrypt9 again. Do the same but say inject health and safety instead of dump, and choose the FBI with banner file. Now you're done (for more precise instructions look at Plailect's guide)