If barcode scanning stays black on your device please reboot your phone.
You can also check our article Barcode scanning doesn't work.
Barcode stays black
If barcode scanning stays black on your device, reboot your phone and then try scanning again. If the scanner still does not work after the reboot, read the separate article called Barcode scanning doesn't work, which goes through the rest of the checks for a scanner that will not start.
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