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Hey guys I am new hear. Sorry I have to start of by sharing my problem. I have a lexus IS250 2007 model. the screen on the navi unit is displaying a message saying " cannot read programme. Kindly consult the dealer." now the problem is that my Unit uses a software installed in a hard disk drive. so I am not able to change anything. I cannot access any function on the unit. Any one with Ideas on how i can fix this problem?

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Your IS should be DVD based, I think it was 2010 before they moved to a flash memory device.

I would check that the DVD is installed, it's hidden behind the clock display 

Here's a you tube video showing how it's done



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