Source review: October 11, 2026. Follow the linked DSi Guide and DS-Homebrew documentation for your exact setup. Their supported installers and procedures can change.
Record the exact failure state
Describe power and charging LEDs, whether either screen flashes, whether sound is heard and what changed immediately before the failure. Test the correctly matched charger and inspect a damaged or swollen battery before further use. A dark screen following a software change deserves a different investigation from a unit that stopped charging after a dropped connector. Avoid deciding that every black screen is a corrupted NAND; a display cable, power fault or missing SD target can create overlapping symptoms.
Try the non-writing software checks
Power off, remove the SD card and test startup. If Unlaunch is installed, try holding A and B to reach its Filemenu. A working menu allows inspection of the default boot target; a working console without the old SD card points toward storage or configuration. Rebuild a tested SD card with the documented menu package rather than immediately rewriting internal storage. Preserve the old card image first so saves and photos are not lost during troubleshooting.
Understand cartridge-based recovery
The DS-Homebrew ntrboot documentation describes booting a recovery program before NAND using a compatible cartridge and the appropriate setup. DSi ntrboot is not the same image as a preflashed cartridge intended for 3DS. Hardware compatibility, flashing the cartridge, the sleep trigger and the required button combination all matter. A known-good NAND backup remains valuable for restoring the original unit. Do not assume that access to a booted program guarantees it has mounted NAND correctly; the project documents initialization limitations and troubleshooting.
Treat NAND restoration as a separate last resort
The DSi Guide's restoration page warns that writes can fail and recommends alternatives for ordinary SD, menu and photograph problems. Use a backup from the same console and the complete documented validation procedure. GodMode9i can browse and extract NAND content, but its repository states that NAND writing code was stripped for safety; it is not a generic full-NAND restore tool. A hardmod is another documented recovery route for a skilled technician. This guide does not give a universal restore command or promise recovery from physically failed internal flash.
Match repairs to the physical model
DSi and DSi XL repair instructions are separate. Display cables and other components travel through a fragile hinge assembly, so a shell replacement is a substantial disassembly rather than a cosmetic shortcut. Consult the correct repair guide before choosing screens, buttons, battery or motherboard parts. Photograph connectors and route cables exactly as documented. After repair, retest both screens, touch input, cameras, speakers, buttons, charging, the game slot and the SD slot. Keep the software baseline and final hardware results together so a later problem can be investigated without repeating an unnecessary internal-storage operation.
Sources and project documentation
- DS-Homebrew: DSi ntrboot recovery
- DSi Guide: restore risks and alternatives
- DS-Homebrew: GodMode9i features and source
- iFixit: model-specific DSi repair guides
- iFixit: DSi XL hinge assembly repair
Preserve first: NAND and save backups.