Att pushes updates on their own schedule. You have no control over it and they never document what was changed when do update. Also you should not search out firmware from other sources to upload into the gateway. It won't work since att makes changes to the firmware. At the minimum those changes include code to verify that it is running on an authorized gateway.
You are up to date with whatever att considers as "up to date". If you want to force it downloaded again push the red factory reset button on the back of the gateway for about 10 secs. Any settings you may have changed will be lost and have to be entered again.
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Makes me highly curious then why my speeds dropped from 920 Mbps to less than 400 sometime a year ago from my BGW210 to my qualified GB Laptop via Ethernet connection. Wifi also deteriorated but nobody can figure out why, except for blaming it all on my equipment. Funny, if I take my laptop to some place else that gets Gigabyte service I can still get in the 900's down and similar up.