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A little more info would help like how are you charging it and no, you don't need a physics degree but you do need to do it correctly and if you get the same results from two different machines then it's less likely to be the reader and more likely to be something else like faulty cable, underpowered USB port, incorrect PSU if using wall charger... as far as test mode available is concerned, contact Sony again as it sounds like they've left the testing software on your refurb...
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