I cant download anything as it says my apple I.D is incorrect

Contact at '1866-877-0191' and get resolved your apple id issue, and also visit us on: https://callpcexpert.com/apple-computer-support-number.php

try step 5 on
https://support.apple.com/en-us/HT201455

If your password to yahoo, or any other email service was correct, they may be asking for your Apple id and password. The Apple ID and password were the ID and password you used to set up the tablet.

All Apple devices have what is called an activation lock. If the incorrect Apple ID was still logged in when you did the factory reset, it will prompt you to log into that Apple ID before you can proceed through setup. Once you have done so, you can log out of the incorrect Apple ID and into the correct one.

This is a security feature that Apple has written into their software to deter theft of iPhones.

Go to apple direct

Visit appleid.apple.com to reset your password. Two options to reset: 1) Answer security questions (most people forget their answers) or 2) Use Email Verification. This is better, but only works if the email attached to the Apple ID is accessible by the user.

My Apple ID

https://iforgot.apple.com/password/verify/appleid
here is the link for resetting the apple password

- most probably those apps which popup now where downloaded before with another Apple ID
- you need to delete them and download again with the new Apple ID... Some iOS Users Reporting Apple ID Error Messages When Updating Apps