GodMode9 | GodMode9 Explorer - A full access file browser

The recommended bootloader for use with GodMode9 is fastboot3DS. There are known issues for some users when using the standard setup based on boot9strap and Luma3DS. If you insist on using that setup follow the instructions found in a certain guide. Here's how to set up GodMode9 (and fastboot3DS) up quickly:. You may now run GodMode9 via holding the X Button (or any other button you chose) at startup. See below for a list of stuff you can do with it.
Download OpenFirmInstaller and follow the quick setup instructions found there.
Copy the gm9 folder from the release archive to your SD card. Then, get good versions of seeddb.bin and encTitleKeys.bin from somewhere (don't ask me!) and put these two files into sd:/gm9/support (optional but recommended for full functionality).
It is also recommended you setup the RTC clock if you're running GodMode9 for the first time. Find the option via HOME button -> More.... Also keep in mind that you should fix your system OS clock afterwards. While you're in the More... menu, you may also set screen brightness to a fixed value of your choosing and manually calibrate the touch screen (not recommended - try the automatic configuration first).
Helpful hint #1: Go here for step by steps on doing some common tasks in GodMode9. Especially users coming from Decrypt9WIP or Hourglass9 may find this to be helpful.
Helpful hint #2: Never unlock the red write permission level unless you know exactly what you're doing. You will notice that prompt when it comes up, it features a completely red screen. It is recommended you stay on the yellow permission level or below at all times to be completely safe. Also read more on the write permissions system below.
Build GodMode9.firm via make firm. This requires firmtool, Python 3.5+ and devkitARM installed). You may run make release to get a nice, release-ready package of all required files. To build SafeMode9 (a bricksafe variant of GodMode9, with limited write permissions) instead of GodMode9, compile with make FLAVOR=SafeMode9. To switch screens, compile with make SWITCH_SCREENS=1. For additional customization, you may choose the internal font by replacing font_default.pbm inside the data directory. You may also hardcode the brightness via make FIXED_BRIGHTNESS=x, whereas x is a value between 0...15. Further customization is possible by hardcoding aeskeydb.bin (just put the file into the data folder when compiling). All files put into the data folder will turn up in the V: drive, but keep in mind there's a hard 3MB limit for all files inside, including overhead. A standalone script runner is compiled by providing autorun.gm9 (again, in the data folder) and building with make SCRIPT_RUNNER=1. There's more possibility for customization, read the Makefiles to learn more. To build a .firm signed with SPI boot keys (for ntrboot and the like), run make NTRBOOT=1. You may need to rename the output files if the ntrboot installer you use uses hardcoded filenames. Some features such as boot9 / boot11 access are not currently available from the ntrboot environment.