You can update the firmware without connecting it to the internet. You will need a flash drive however.
the firmware file can be found here: http://www.samsung.com/us/support/owners/product/BD-F5100/ZA?#
Instructions on performing the firmware update are here:http://www.samsung.com/us/support/howtoguide/N0000071/9589/107541/BD-F5100/ZA
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Okay, let me know what happens. Also, try getting a can of compressed air and spray out the inside of where the disc slides in. Alternatively, get a cleaning CD and run that on the player. I have seen some players start having issues with BluRay discs (and not DVDs) if they get dirty. The BluRay discs are much more finicky and less tolerant to a dirty lens on the player.