UPDATE: There is a new very simple fix, please check out my new video showing this:
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A common problem with Samsung Galaxy Phones is the "Warning: Camera Failed" error message when the rear camera stops working. We show you the simple steps to go through to get this fixed.
Note: I go through the possible ways to fix this in order of "least impact on your phone"... i.e. the first method doens't change anything, last method (which actually worked for me) resets some settings.
