Edit: This post now has an article on RGDWiki.

While I was looking online, I came across a user on NintendoAge by the name of ProtonX. He showed in a post 2 debugging DSi's (aka Panda DSi's) that had some debug applications on them, like TwlNmenu. I asked if he still had those, but unfortunatly, he sold them off. However, he did had another thing to show me:

A development Nintendo DSi that was never seen before!

This is what ProtonX has to say:
"Pretty much like a DSi. It boots to this weird menu, with no cart. However with a DS cart, it boots games regularly. I haven't yet opened it up to see what board revision it has. I picked it up with some different color prototype Game Boy Pocket's (already sold)."

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These are some general differences:
-The console has a glossy finish, rather than the plastic you find on a regular DSi. This was probably done to make costs for these development kits easier.
-The button prints are darker than the ones on a regular DSi. They're now black instead of grey.
-There are no prints for POWER, START, SELECT or any of the icons for connections, power or charging.
-There are no prints on the back, only a big yellow sticker that translates to 'Only for development.'
-The console boots to a different kind of menu rather than a system menu, which I'll explain now.

This menu is all in Japanese, there might be an English language, but I'm not sure. When you turn on the console without a cart, it just boots to this. After doing some minor translations and watching a video he sent me, this is really just a development version of the System Settings. These are the options:

-Language - Changes the language, but there might just be only 1 language for this console.
-Set Time & Date - Changes the time and date of the system.
-Change User Data - Allows you to change user data (name, message, nickname, birthday, ect).
-Calibrate Touchscreen - Calibrates the touchscreen, but it doesn't let you test it afterwards.
-Wireless Connections - Allows you to turn on or off wireless connections, like Wifi or Download Play features.

Later on, he sent me images of the motherboard as well.

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The only noticable difference that I could find is instead of a writing on the board saying CPU-01, it says CPU-X4. This makes me speculate this was used during the DSi's lifespan, rather before the release. (Note that the battery may not be the original, as all of his 1st-gen batteries died.)

On top of that, he sent me a video to check out (as promised). It basicly showcases everything it has to offer.

(If the video does not play, then click here to download or watch it via MEGA.nz)​

Aaaaaand..... That's it for now! That was basicly everything he told me so far (beside a NAND dump). What do you think about this unit?
-Trash_Bandatcoot