Thanks guys.
Downloaded V5 and pot onto a USB drive (16Gb) smallest I have. With the line put it into the front of box, powered on and screen went to boot and won't move. Powered off and pot usb in the back, same thing happens
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At the moment sub is doing a full fat 32 not quick format
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Quick update, box is flasing as I type. Only need to make sure the line works again
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Flashed, installed, line added and working perfectly. Thanks guys for all advice.