The R4 Revolution for DS / M3DS Simply — both products are identical apart from branding and slight firmware differences — is a Slot-1Device for the Nintendo DS that runs code from its built-in MicroSD slot, with built-in PassMe.
Recent DLDI builds of DSLinux have been reported to work "out-of-the-box" with the R4/M3DS Simply, with no additional patching required — simply extract the DLDI build to the root folder of the MicroSD card.
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