nothing do!That's true, but would instinct v6 really protect from that with bad installations?
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humm, maybe even you need resistors on the data lines. but sounds plausible.Not an issue. Solder in the wires for the modchip install, connect to your card reader excluding both VCC/VCCQ. Then turn the Switch on. It should not be able to boot possibly getting stuck in RCM mode. At this point connect the card reader to your PC and see if it works. The Switch mainboard is powering the eMMC and the PC powers the reader but since only ground is connected no power will backfeed.