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What does the "Positioning Circle Test" tool for fingerprint calibration look like?

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Ping atos

Dec 20, 2012
Hi all, I recently replaced the screen assembly and that disabled the fingerprint function. I figured I had to follow this tutorial, but actually go through the calibration and don't replace the persist files after calibrating.

Half way through the calibration it prompted for the "positioning circle test" but I don't have the tool for it or don't even know what it looks like...
Does anyone have a product link for the tool?