On July 30, 2025, the U.S. Executive Order “Suspending Duty-Free De Minimis Treatment For All Countries” came into effect. This removes the previous duty exemption for low-value packages and introduces new procedural requirements that are still being defined by U.S. Customs and the United States Postal Service. In response, DHL has announced a temporary halt to standard postal parcel shipments into the U.S. and Puerto Rico. Dismiss
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There should also be a bios folder along with the ROMs folder that autopopulate when you’ve plugged it in.
This page details how to do it:
https://github.com/RetroPie/RetroPie-Setup/wiki/First-Installation