If I sold my psp how does the new owner reset it and register it with his account ?

To buy content and deliver it to your device, you will need to connect to a wireless network and register your Fire tablet to an Amazon account.
If you are setting up a new Fire tablet for the first time, you'll be taken through setup instructions and will have the chance to register your device. Follow the instructions on your screen.
To register your Fire tablet outside of the initial setup screens:

1. From Home, swipe down from the top of the screen and then tap Settings.
2. Tap My Account.
3. Tap Register.
   • If you already have an Amazon account: Enter your Amazon account information, and then tap Continue.
   • If you do not have an Amazon account: Tap Start Here, and then follow the instructions to set up a new account.

Note: If you've forgotten your Amazon account password, you can reset it by requesting that a personalized "password reset" link be sent to your e-mail address. To learn more, go to Reset Your Account Password .
If you need to deregister your device from an Amazon account, follow the steps above, and then tap Deregister. After you deregister your device from an Amazon account, you won't be able to access items stored in the Cloud for that account.
After deregistering, you can register your Fire tablet to another Amazon account. Related Help Topics

• About Wireless Display Methods for Amazon Devices

If it is "Your" iPad and was originally registered to only "you", you can contact Apple for a temporary password which will allow you to change it to your own personal password of choice. All Apple devices are registered when sold and first initialized by their new owners.

Direct from online directions:
To register your Fire tablet outside of the initial setup screens:

1. From Home, swipe down from the top of the screen and then tap Settings.
2. Tap My Account.
3. Tap Register.
   • If you already have an Amazon account: Enter your Amazon account information, and then tap Continue.
   • If you do not have an Amazon account: Tap Start Here, and then follow the instructions to set up a new account.

Note: If you've forgotten your Amazon account password, you can reset it by requesting that a personalized "password reset" link be sent to your e-mail address. To learn more, go to Reset Your Account Password .

very simply, you access the Kindle devices "Settings" page and in the section that says register/deregister, you would click on the deregister option, once the device is online with the built-in wireless network connection. After which, the device is ready to be registered to a new account.
Please be aware that just changing the devices account registration does NOT delete any content; also changing registration does not provide the new owner the legal access to the books already downloaded to your Kindle, the original account that purchased the books, will retain ownership.
There is no way to give your purchased book library to the new owner of your old Kindle. If the new owner likes the books, then they will have to buy them on their own, to retain future downloading rights.

If the user whose account is registered is unavailable, factory reset the phone.

Make sure, the phone is not stolen or the real owner is aware.

Also provide more details of what kind of lock.
Image would help

the only way is to contact thier tecnic suport. Then they will ask you questions to prove that you are the true owner of the account.

This problem is usually associated with your PSN Account that is registered with the game you purchased. Try the following:
1) On your PSP Go, go to the "PlayStation Network" Icon and set up your PSN Account name so that it is the same as your PSN Account on your PC. (I'm under the assumption that you accessed the PSN Store via your PC and bought the game instead of using pirated software.)
This should allow your game to be playable since it's under the same PSN account name.
If this fails to work, there are ways around it.
2) On your PSP Go, if your PSN Account isn't identical to the one on your PC you can remove that account from your PSP Go. If your PSP Go doesn't have an account, the game can be playable since PSN has no way of knowing if the game is yours or not.
To do this however, will most likely require a format of your PSP Go so make sure to back up your data.
To format simply go to "Settings" then scroll down towards "System Settings" click on it, and then scroll down and click on "Format Memory Stick".
(NOTE: This will erase all of your data so make sure to back up all your Photos, Music, Videos, or any save content on your PC or USB Drive. As for game purchases, those should be registered on your PSN Account so you don't have to worry about those.)
Thank you.

Sure is

the games are tied to his account because thats the person who bought them. the only way to play them is from the previous owners account