Welcome to BB Forums.
Wow - a 7270 - haven;t seen one in a while.
A 507 means that there is no handheld OS on the device. Been wiped out when you typed the password wrong the 10th time.
I believe you can download the Handheld OS for the 7270 directly from the RIM BlackBerry web site at BlackBerry
Try here - https://www.blackberry.com/Downloads...93E4F3BB068C22
- and select the 7270.
Stop Desktop Manager
Download the software
Install the software to your PC
Restart Desktop Manager
If it does not start to load the OS, then start Application Loader.
You may want to restart your PC after installing the Handheld OS to your desktop.