Originally Posted by JSanders
Error 507 just simply means no OS was found, and you really don't even need JL Cmder for that IF the DM recognizes the BB attached, it will normally prompt to upgrade or install the OS.
Yes, it does that, the problem is that even without OS there is probably something that conflicts with thw new installation, which always ends with an error (as I said, connected to a "multi-stage operation").
I had the same problem with the Pearl of my gf, but some way I managed to have the device wiped by Jv_Cmdr and then the installation went fine. If only I could remember...