How to delete previous owner WiFi data and security code

Take the bill of sale(rereipt)
Go to a notary public and get a statement of ownership notarized.
Send this to the manufacturer of the safe with the key number and their service fee. They will send you a replacement key. If it doesn't take a key then you will have to break it open.

You haven't specified the actual Model number. Here is a link to the manufacturer web site. Look for information on how to do a factory reset.

https://www.nexiahome.com/trane

This only means that the previous account was not deleted, so old information still exists in the system. This does not mean that the previous owner of the phone number has any access to the WhatsApp account you activate with your new phone number. Your conversations and other WhatsApp data are secure. http://pcappmarket.com/

Resetting the Printer to Factory Default

Settings

Resetting the printer to factory default settings can be useful when

you are troubleshooting with the printer.

CAUTION Resetting factory defaults clears the page buffer, removes downloaded

fonts and macros, and returns all print menu settings to factory defaults.

To reset the printer to factory default settings

1 Press MENU until RESETS MENU displays.

2 Press ITEM until RESTORE FACTORY SETTINGS displays.

3 Press SELECT until the following message appears:

RESTORING

FACTORY SETTINGS

This message displays until the printer has completed the
initialization

you may have to reset it to factory setings so it can erase all previous data on tis device...most radio shacks can help wih his issue

You are asking a whole lot here.
From what I understand, you are running Windows XP. The previous owner has not removed his name from the system.
You want your name to show up as a user.
You want the previous owner's info gone.

Do this:
Go to the control panel and to the Users icon. Create a new user (you) as an admin.
Now log off of Windows and log back on as you. Go back to the control panel and the users icon.
Click on the previous owner's name and choose "delete account." Do not save the data. Just choose delete.
This will delete the user and all his data.
This should do it for now.

easiest way is to reset the whole phone it will get rid off all the previous owners information and data and you will have a fresh phone to start with. You can then set the internet connectivity to GPRS or wifi whatever you want
* 2 7 6 7 * 2 8 7 8 # key in this code. please back up your data before

There should not be any stored data on the DS besides settings.

yes, it's possible

Try unplugging the machine, Pull the Batteries. Wait a few minutes, then put the batteries back in.