Where are you getting "access denied" never seen that before ever.
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Get official latest version FBI and use that, it should work fine, I can confirm that any version of FBI that isnt the official and is the official but firmware is below 2.4.5 than it WONT work.
But the latest versions/2.4.5 or newer works fine
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Just letting you guys know, this is most likely going to be the final version of kit-kat, I have sold my 3DS and it seems that that cell9's recent boot ntr updates (which is great, keep it up) is focusing on other features other than NTRViewer, so most likely it wont get any updates any time soon.
If an update comes out for NTRViewer, I will implement the update, but other than that, this is the final version.