Locked out of BB 8707g

[dodgyrog]

entered incorrect password 10 times thinking it would wipe the data before deploying to new user. unfortunately I cannot do anything with the BB as all I get now on turning it on is something like a video taped in a circle with a line through and the number 507 below. What have I to do to get it back to normal??
Any help appreciated

[dc/dc]

Reload the operating system using Application Loader.

[aiharkness]

Wirelessly posted (8820)

Error is no OS. Reinstall the handset software (i.e. the OS).