Why would you restore an account you have no password for?
You shouldn't be restoring someone's information on your device. Either sync the contacts from google/outlook or a mail client like Thunderbird.
As I understand your post. Someone wants to move their information from the BlackBerry 8520 to a BlackBerry 9800. If the old user of the 85xx is going to be using the 9800, then a device switch is all that is needed. KB23677-How to switch devices using BlackBerry Desktop Software
If a different person wants the information contained in a backup file (Password Protected), then you will have to get the password from the rightful owner. As far as your contacts go, you really should use device switch or import from a service you already have (as listed above)
Once the device is wiped, it is wiped and will not ask for a password or BBID (But you will be prompted to sign in or create one at some point)
1. Blank the BB - Security Wipe http://btsc.webapps.blackberry.com/b...ListHelperImpl
2. Only if you have access to the device or the save file from the older phone.
3. You will have to create a new BBID (BlackBerry ID) and then you can setup the device with accounts (Gmail, outlook, AOL, etc...) You will need a BlackBerry specific Data Plan.