How do change the combination on Brinks Home security saft Model 5074 serial #120.0401A

You can't. This safe has a rotary combination lock and a failsafe key. The key is your insurance if you can't get in.

Call a local locksmith, for what will probably be destructive entry unless you have the serial number of the safe. A GOOD locksmith may also be able to impression a key for you. According to this you can get keys on proof of ownership.

https://www.lockpicking101.com/viewtopic.php?f=36&t=64109

How can I get the combination for our brinks fire safe model ...

Answers https://www.answers.com > Hobbies > Guns & Weaponry
Sep 15, 2023 - Get the model and serial from your safe as well as the key number. Call Honeywell @ 800-223-8566.

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notify brinks or a locksmith

copy and paste
https://support.firstalert.com/s/article/brinks-safe-manuals

this is not the brinks website

Locate the model and serial numbers on your safe and write them down. ...
Write down the key number for your safe. ...
Contact Honeywell customer support at 877-354-5457. ...
Explain your situation to the representative and provide them with the safe identification information and your contact information.

https://www.hunker.com/13419341/how-to-get-a-combination-for-a-brinks-fire-safe

Yes contact a locksmith.

Contact a locksmith

I have a Brinks model 5074. I did the notarized statement to Action and they sent me a set of keys to open the safe. However, I also asked for the instructions on the sequence to set the electronic key pad. Obviously, they didn't send the ops instructions and it's a holiday weekend. Can you provide the insturctions?

You need new batteries. Better find the keys.