Nintendo will almost certainly refuse to repair any DSi or other console that's been modded.
If you've backed up your NAND, which is always a good idea when modding, you might be able to use unlaunch to restore the backup. No links, because that's against forum rules, but you should be able to find guides with a bit of searching.
If you've not backed up the NAND, you're into the realms of hard mods and I genuinely can't give you any pointers on that.
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Topic: How to boot or restore bricked Nintendo DSi?
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