Newbie...
I have read all over this site looking for help to resolve my issue.

BB does connect and communicate...

I downloaded the DM and SW Upgrade for BB7520.
(Performed several times)
Installed DM then SW then connected. Even tried every variation of this I could try.

I've used JL_Cmder to wipe.
Battery is fully charged.

Every attempt to install the software stops at "Load Radio Software" and error 507 on the BB

PS. I have also tried on another BB same model and it also has a 507 error.
Both worked prior to upgrade attempt.

Thank you,
Bobby