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Have not checked the firmware version on my MagSafe charger recently. Would love to know the changes with these firmware updates.
 
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Wait, even the chargers have firmware???

Well guess today I learned
Everything has some chip with firmware. Your electric toothbrush has firmware. Most are just not updatable.

Thats the 15w model, not the 25w
I didn’t realize there was a 25 watt version. I’m guessing this only works with the newest iPhone.

does it include third party MagSafe?
No, the update is just for the Apple branded MagSafe charger of that specific model. Apple is pushing out an update. Third-party MagSafe chargers would have to be updated by whoever makes the charger. I seriously doubt those will ever receive updates.
 
The 25W charger (the model is A2580 or A3250) is FW 148. The 15W is A2140, FW 258. I plugged the 25W into my MB Pro and it updated immediately to 148.
 
Maybe this has something to do with the new adaptive charging they've added to iOS26
They didn't add "adaptive charging" -- the feature in iOS 26 is "adaptive power" and uses the analysis provided by Battery Intelligence to optimize power *consumption*, by, for example, postponing system maintenance tasks until a time that you're not using the phone.
 
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