nuvi 5x seem to have a problem like 14xx where the USB socket connections to the MO are prone to fail. Try taping the cable to the rear of the case to put some slight upwards pressure on the usb plug and see if the connection to the PC becomes stable. I have a 1490 like that, regardless many updates can be done using txt commands from sd.
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Thank you guys..now I know its a hardware issue...I will try to fix it somehow...if I get lucky I will post it here...