Hi, I bought a used hacked old 3ds. I deleted all the files on SD card. Even the important ones. Now it won't open. Just a blue light flashes. I don't know which version Luma3ds was. I need help.
I readded via a mobile phone but didn't worktry readding the boot.firm.
I don't know. What is a9lh?maybe you're using a9lh? what firmware is your system on?

What should I do then?Another problem might be b9s version. I don't think older versions are compatible with newer luma.
What kind of "blue light flashes"? Does it the screen stays black after that? Does the blue led (power) stays on & doesn't turn off?Hi, I bought a used hacked old 3ds. I deleted all the files on SD card. Even the important ones. Now it won't open. Just a blue light flashes. I don't know which version Luma3ds was. I need help.
Screen stays black. Blue light turns on and out after 2 seconds. Luma menu doesn't show up.What kind of "blue light flashes"? Does it the screen stays black after that? Does the blue led (power) stays on & doesn't turn off?
Like others have said, check what version of Luma3DS you have, remove the sd card and hold the select button on boot for Luma3DS menu, and hold select on boot for GodMode9.
If you Luma3DS ver. 7.0.5 or below then you're on A9lh, and you need to update to b9s..
Take a look here: https://3ds.hacks.guide/finalizing-setupHow to install homebrew a and games?
Just press start after that it should take you to the home menu. And yea, follow the Finalizing Setup guide to install the Homebrew Launcher & FBI.The latest version Luma3ds worked. Now what to do?

Simple, read:The latest version Luma3ds worked. Now what to do?
first at all read https://3ds.hacks.guide/ and you will get more familiar with the hacking process, you need some files on your SD Card to work.
Try to keep pressed Start while you turn on the console.
on the guide there is a section about the concepts and FAQ