How to recover a hacked Apple Account after an update?

"My account has been hacked after updating"

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Troubleshooting a Hacked Account:

Secure your Info:

If concerned for device access, then (A)verify your devices, and (B)secure your account. Open a new eMail addressed and use that for your Apple ID.

1. Verify your Devices:

Verify that all devices are logged in to your account, by using this link: Check your Apple ID Device List to See where you're Signed in - Apple Support

then...

2. Modify your Credentials:

Having been stollen, someone lily has your credentials. So, by all means, modifying them.

• Modify: your login credentials (Using Both a New eMail and a New Password for each and all sites)
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option

III. Report Items to Apple:

Also, report phone calls', text messages', and eMAil messages' info to Apple and others.

Use my User Tips:

• Using the Photos App to Report Scams - User Tip
• Use eMail Headers to Report an iCloud.com eMail Imposter to Apple Support: - User Tip
• How AND Why to Provide Headers when Reporting Scam eMails: - User Tip

What sort of issues or errors or problems are you encountering with whatever gear got updated?