Games not working online or disk

try this troubleshooting from the answers

https://support.xbox.com/en-US/help/errors/error-code-8027025a

if it doesnt work try reset and keep my apps and games like below

1. Press the Xbox button  to open the guide.
2. Select Profile & system > Settings > System > Console info.
3. Select Reset console.
4. On the Reset your console? screen, you'll see three options:
   • Reset and remove everything. This option resets the console to factory settings. All user data, including accounts, saved games, settings, home Xbox associations, and all games and apps will be deleted. Use this option when selling
     or gifting the console, or as a last resort in some troubleshooting cases.
   • Reset and keep my games & apps. Use this option as your primary choice when troubleshooting. It will reset the OS and delete all potentially corrupted data without deleting your games or apps. In some cases, if a corrupt game file
     is causing the issue you're troubleshooting, you may have to choose Reset and remove everything, but you should always start with Reset and keep my games & apps.

Jesse ,

First I move my games from the int disk to the ext disk as you said. And i replug the ext hdisk. I start the games and it wont start either if I m online or offline

Do i need to copy that games on the int disk to make it work?

Disk OK - hired another copy and got same error. Other online games work fine. Only problem with Black ops?

I also tried everything and nothing was working. Then found that:

“This error appears to me too, the store downloads about 900mb and then when try to install it failed.

Here to solve this problem i wait the store to download, when the error appears maintain store open, then right click in my computer and them click on manage.

On the new windows click on manage disks, this shows your disks, you note there's a tiny disk (about 1gb in size), it's a virtual disk but it's offline, simple right click on then and bring this disk online.

Seconds later windows throw a notification about flight simulator is installed, from this point is only open the game to install the rest of data.

Hope this helps all here.”

i tried with a game, downloaded it, error appeared, i downsized the xbox window, clicked “retry” in the xbox app and a temporary disk appears in the disk management window, i right clicked on this disk and put it online, then the game worked.

sorry about that I didn't test it. I looked online found some different ones. tested them and none of them worked. I have the startup disk and the disk doesn't even work.