1) Download newest firmware (if you have not already)
2) Download the update (link below the video)
3) Copy the new _ismart folder to the root of your microsd card (replace the old one)
4) Put it into your 1.4.2 DSi and you are done
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How to update iSmart MM to work on DSi v1.4.2 Firmware
DSi v1.4.2 bypass