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Look for an option to export "XPUB", and import that thing to sparrow.
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For mk4 you insert an SD card, then on the coldcard go to Advanced > MicroSD Card > Export Wallet > Sparrow
This will write a file called something like sparrow-export.json onto the SD card. Move the SD card to your computer, open sparrow, select import wallet, then pick the file from the SD card.
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