Unlock hp 6515
Thats very easy.
1: Download the (upgrade and unlocked) ROM from HP's website
2: HardReset your phone, but leave it in the first welcome screen (before the align screen and so)
3: Connect the phone to your PC, and wait for the connection to be established.
4: Run the downloaded Upgrade package (from HP), the phone will show a bootloader-screen.
Sometimes, the phone will not accept the upgrade program.
In that case do the following, but nothing else!
1: Disconnect the phone and soft reset it (it will come back into the bootloader)
2: Close the HP-upgrade program with taskmanager on your PC
3: Reconnect the phone to the PC
4: Rerun the HP ROM upgrade program.
Now your phone will show its upgrade status. It will take a while (about 20 minutes or so), but afterwards you will have a clean unlocked 6515.
I did this with several locked phones (especially Vodafone) from international sources.
Above will work fine, on every PC with Active-Sync (in my case 4.5) installed.
I assume, you will have a backup, made by the SIP-backup program on one of your memory cards. You can restore it after you've upgraded your phone