Gnirfleo never made any releases. Nearly everyone considers it a hoax.
With Okiwi, you have to put the "okiwi" folder on the root of your card for it to work. The first time you boot it, it will take a long time to function as it generates the fonts. However, if you get a red screen on top, then it's a filesystem error so waiting longer won't help anything. Make sure you patch okiwi.nds with DLDI.
Other recommended browsers are DSOrganize, DSHobro, and Bunjalloo. You can also try Retawq in DSLinux, or Links as well if you have additional RAM in slot-2.
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