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Error 507 means no operating system on the BlackBerry. Is it new or used?
Here is what you need to do... read through this link, and you can start at Instruction #2, under "Wipe the Device" where it speaks of the 507 error. How do I wipe the BlackBerry using Jl Cmder? - BlackBerryFAQ
If that does not work, you might want to walk through that FAQ link from beginning to end to make it work.
The 507 error is not a big deal, and IF you follow the instructions eactly as posted, you will be fine, i believe.