Will you be kind enough to let us know the brand of your phone
Go to accounts in setting and select new account then sign in with your email and password
SOURCE: how do i reset my laptop to factory settings
What OS are you having?
Reset windows password as following instruction :
On XP you can try this:
Boot computer and press Ctrl+Alt+Delete twice when you See Windows welcome screen / login screen. It'll show classic login box. Now type "Administrator" (without quotes) in username field and leave password field blank, press Enter and you should be able to login Windows.
Now you can reset your account password from "Control Panel -> User Accounts".
On Win 7 or Vista:
Ctrl+Alt+Delete won't work, you have to use some windows password recovery software. I recommend Windows Password Reset .
SOURCE: I gave my friend my LG Optimus Dynamic
1. Power down the phone then remove/reinsert the battery to ensure that the device is completely off
2. Press and hold the following keys for 10 seconds: Volume Down + Home Button + Power Button. Release all 3 keys when the Android Recovery Menu pops up
3. Press Volume Down to scroll down and highlight "wipe data/factory reset"
4. Press the Menu Button to select
5. Press Volume Down to scroll down and highlight "Yes - Delete All User Data".
6. Press the Menu Button to select
7. After data wipe is complete simply highlight "reboot system now" and select it by pressing the Menu Button.
SOURCE: How to factory reset Digiland tablet dl721?
go to this link and see if it helps you... How to factory reset Digiland tablet dl721 Google Search
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