help me troubleshoot this phone

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I got a used xz1 compact the other day and have just now gotten around to look at it. It lay charging out of the way , so did not deal with it right away. I have no idea what is "wrong" with it and hope some of you guys in here might be able to help me troubleshoot it .When I turn it on , it shows an open lock pictogram and says " Your device software can't be checked for corruption - Please Lock the bootloader."then it boots up..well I would say it boots up fine. Sony logo and I can...Read more