Sony Alpha 1 (ILCE-1)
firmware v4.00
Sony · Released Dec 9, 2025 · First seen Jul 4, 2026
v4.00 is the latest firmware for the Sony Alpha 1 (ILCE-1), released December 9, 2025.
What's in this update
Please read this page before proceeding to the latest update. You will find the benefits and improvements of the latest update explained on the download page.
updatemystuff.com never hosts firmware files — always download from the official source.
Get it from SonyWatch the Alpha 1 (ILCE-1) for updates
Create a free account and get an email the moment Sony publishes new firmware.
Create account & watch