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The mirror image is an Android issue, apparently, and not specific to this device. There is no fix.
Even mirroring the barcode image, so the mirrored camera sees it correctly, it still won't read it. I'm guessing it's either a resolution issue (the camera is only 1.3 MP, no idea what the low-res limit is for barcode scanning) or there simply isn't enough contrast for the software to detect the barcode is there.