That is a very concerning message. It sounds like your phone has been factory reset, and now it's asking for a previous PIN. This is a common security feature called Factory Reset Protection (FRP).
Here's what this means and what you should do:
What's Happening?
Factory Reset: The message confirms that your phone has been wiped of all user data, apps, and settings. It's in the same state as when it came out of the box.
Factory Reset Protection (FRP): The request for a "previous PIN" or, more commonly, a Google account login, is a security measure designed to prevent unauthorized people from using your phone after it's been reset. If a thief steals your phone and tries to wipe it, they can't use it without your credentials. This makes stolen phones less valuable.
Why Did This Happen?
This could have happened for a few reasons:
You initiated the reset: If you or someone else with access to your phone intentionally performed a factory reset, this is the expected behavior.
A software issue: In rare cases, a system update or a critical software error could trigger an automatic factory reset.
An unauthorized reset: Someone may have gained access to your phone and reset it without your permission.
Remotely triggered: If you had a "Find My Device" feature enabled, you might have accidentally triggered a remote factory reset.
What Should You Do Now?
Enter your previous PIN: The first thing to try is to enter the PIN that you were using on the phone before it was reset. This is the simplest solution.
Try your Google Account (for Android): If the PIN doesn't work or if your phone is an Android device, it will likely ask for the Google account details that were previously synced on the phone. This is the most common form of FRP.
Enter the email address and password for the Google account that was on the phone. This is crucial-it has to be the exact same account.
If you can't remember your password, you can try to recover it on a computer or another device.
Check for Other Account Logins: Some phone manufacturers (like Samsung) have their own account systems. If you had a Samsung account, for example, it might also ask for those login details.
What If You Can't Get In?
If you are unable to provide the correct PIN or Google/brand account information, the phone will remain locked. There is no easy workaround. This is by design to prevent theft.
Contact the Manufacturer's Support: If you own the phone and have proof of purchase (receipt, invoice, etc.), you can contact the manufacturer's official support. They may have a process to help you unlock the device after verifying your ownership. This is a last resort and can be a lengthy process.
Do not use third-party tools: Be extremely wary of websites or software that claim to bypass FRP. Many of these are scams, can install malware, or will not work at all.
This is a serious security lock, and the best way forward is to use the credentials you had on the phone before the reset.