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With the release of TWLTool by @WulfyStylez, we now have the ability to downgrade our DSi consoles and install the old DSiWare hacks that were originally released by Team Twiizers. This is achieved by recovering our DSi's per-console keys.
To outline the process, I'll divide it into a few sections.
First, you must recover your keys and install an exploitable DSiWare game from the DSi Store.
Next, you must backup your NAND with a hardware tool, and use the keys to decrypt it, modify it, and re-encrypt it.
And last, you need to set up your SD card for running these exploits.
DSi Downgrading - The Complete Guide
To outline the process, I'll divide it into a few sections.
First, you must recover your keys and install an exploitable DSiWare game from the DSi Store.
Next, you must backup your NAND with a hardware tool, and use the keys to decrypt it, modify it, and re-encrypt it.
And last, you need to set up your SD card for running these exploits.
DSi Downgrading - The Complete Guide