Th' colors 'o th' devices in th' image may vary, but note th' button placement 'n features 'o each device carefully to ensure ye be selectin' th' correct one.
Different device models, versions, 'n regions gunna require different steps to achieve th' end goal 'o arm9loaderhax Custom Firmware. This page will help you find where to start for your device.
If ye have already hacked ye 3DS before 'n be havin' an EmuNAND based CFW setup, jus' follow all instructions while on SysNAND. Ye data gunna be transfered from EmuNAND to ye new A9LH install at th' end.
Before startin', ye may want to check ye SD card fer errors usin' [H2testw (Windows)](h2testw-(windows)), [F3 (Linux)](f3-(linux)), or [F3X (Mac)](f3x-(mac))!