Since the data is flashed onto the card, you don't need to keep files on the external/useable all the time. Sometimes (wrongly) called firmware, it can also go by 'menu', 'system', 'OS', etc.It is not dangerous to accidentally use the wrong loader or put it in the wrong place, so don't worry about getting it wrong, it can't hurt.
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You should always run the very latest loader/firmware on your card.
A few bits of terminology: Firmware Firmware is (in the flashcard context) the card's system flashed onto read-only memory on the card.
The updating process is potentially dangerous, but only really if you do it wrong.
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After the flashing stops the process is finished, and you can delete the F_CORE. If no light turns on at all, the cable is probably loose or not making contact (they are often very tricky to work).
Move and bend the cable and card around to try and get connection.
In the archive you download will be an installer file. When the app opens, select the 'Setup Sakura (I)' menu option - if the interface is in a different language, choose the Lanuage option (the one with (L) after it) and select your language of choice.