Put these files in the "a9lh" folder on root
Put SafeA9LHInstaller's "arm9loaderhax.bin" on root
Turn on 3DS
Press select (Doesn't matter if it has a black screen)
Hard-Restart
If you can see the screen - they you're not bricked anymore
I've done this before. I upgraded A9LH. It didn't do anything. I just performed this again, it updates successfully. I put the old arm9loaderhax.bin back in place still no boot.