Unexpected 3DS update breaks many common homebrew hacking methods

That Didn't Take Long: Nintendo 3DS Hacked

[Tech Rules] How a Terrible Game Cracked the 3DS's Security - Early Days of 3DS Hacking

New 3DS turns on and off with a popping sound and flash on bottom screen. I've heard this can be caused by loose connections with the speakers, top screen or 3D slider, but I've checked and reconnected all three times by now. Any other possible causes? 

my-new-3ds-turns-on-for-three-seconds-and-then-off-with-a-popping-sound ...

Here’s how to run homebrew on your 3DS

Install Homebrew 3ds

3DS Homebrew Channel And Custom Firmware