Can I upgrade my iMac Model A1419 to macOS Big Sur?

If you forgot your Mac login password:

https://support.apple.com/en-us/HT202860

Intel Mac

1 - Restart computer and immediately hold Command + R keys

2 - Top Tool Bar > Utilities > Terminal

3 - Type resetpassword as one word and no spaces

4 - Press Return key

5 - Follow the prompts and remember the New Password

Hello, ned73.

How to Upgrade to  macOS 11 Big Sur:

These Mac models are compatible with macOS Big Sur:

• MacBook introduced in 2015 or later

• MacBook Air introduced in 2013 or later

• MacBook Pro introduced in late 2013 or later

• Mac mini introduced in 2014 or later

• iMac introduced in 2014 or later

• iMac Pro

• Mac Pro introduced in 2013 or later

To find the details about your Mac model, click the Apple  icon at the top left of your screen and choose About This Mac. 

❗️– IMPORTANT – Backup your data. (You’ve been warned.)

Learn How to Back up your Mac with Time Machine:

click > https://support.apple.com/en-us/HT201250

❗️ – IMPORTANT –  In Catalina and Big Sur your 32-bit apps will no longer work.

Get this free utility to check the compatibility of your apps:

click > St. Claire Software – Go64

📚 – Check Compatibility of your Mac with newer versions of macOS.

Learn how to upgrade macOS:

click > https://support.apple.com/en-us/HT211683

✅ - Download the macOS 10.11 Big Sur upgrade installer here:

click> https://apps.apple.com/us/app/macos-big-sur/id1526878132?mt=12

(Don’t use FireFox for this link)

The download will place the "Install macOS Big Sur" application in the Applications folder. Double-click the installer to begin the upgrade process.