I can’t log in or log out my iCloud and I can’t update my iOS

Issues with Updating iOS and iCloud Login:

1. iOS Update Issues:

   - There could be various reasons why you're unable to update your iOS, such as insufficient storage space, network connection problems, or software glitches.

2. iCloud Login Problems:

   - Difficulties logging in or out of iCloud might be related to network issues, incorrect password entry, or account-specific issues.

Troubleshooting Steps:

1. Check Internet Connection:

   - Ensure you have a stable and active internet connection, preferably over Wi-Fi, to facilitate the iOS update and iCloud login processes.

2. Free Up Storage:

   - If you're unable to update iOS due to insufficient space, try to free up storage by removing unnecessary apps, photos, or files.

3. Restart Your iPhone:

   - Start by restarting your iPhone. A simple restart can sometimes resolve temporary glitches affecting system functionalities.

4. Check iCloud Status:

   - Verify the status of iCloud services on Apple's system status page. Temporary outages could impact your ability to log in or out smoothly.

5. iCloud Login on Web:

   - If you're having trouble logging into iCloud on your iPhone, try accessing your iCloud account from a different device using a web browser to see if you can log in successfully.

6. Reset Network Settings:

   - In the iPhone settings, you can reset network settings to clear any network-related issues that might be affecting your ability to update iOS or log in to iCloud.

7. Update iOS via iTunes/Finder:

   - If over-the-air updates aren't working, try updating your iOS using iTunes (on older macOS versions) or Finder (on macOS Catalina and later) on a computer.

8. Contact Apple Support:

   - If the issues persist after trying these steps, consider reaching out to Apple Support. They can provide further insights and guidance tailored to your specific situation.

Apple ID and Activation Lock

iCloud uses Apple ID credentials.

If you do not remember the Apple ID Password then follow the steps given in this Apple Article -> If you forgot your Apple ID password - Apple Support

If you do not remember the Apple ID then follow the steps given in this Apple Article -> If you forgot your Apple ID - Apple Support

If you are the owner or the owner has shared all information with you then to open Activation Lock:- If it is Activation locked, read here --> Turn off Activation Lock - Apple Support Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Learn how to remove a device from a previous owner's account.

If you are not the owner and do not have the Apple ID and Password then there is no way that you can get into this iPhone unless the original owner shares the Apple ID and password with you. If you are lucky you can get into this iPhone if they (owner) accidentally remove the device from their Apple ID.