AnyU
From PHWiki
Asia only flash kit for GBA, that due to its very low price is starting to spread internationally.
The AnyU itself seems to be some kind of USB memory device, probably NAND based flash. It's got a USB connector on one side, and GBA link port connector on the other.
You connect the USB side to a PC to upload or download roms to the AnyU or PC.
You connect the GBA link side to a GBA to flash to the GBA Flash Card or dump roms to the AnyU.
It seems to be sold with at least two differently labelled flash cards, Any C and Super FC.
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