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Over its lifetime, the Canon 5D Mark II received several important firmware updates. Understanding this evolution helps to appreciate what each version brought to the camera: canon 5d mark ii firmware update 213 download updated
The sole change in version 2.1.2 is to optimise the camera’s performance when using UDMA 7‑compatible CF cards that came to market from February 2012. UDMA 7 cards offer faster read/write speeds, and this update ensures the 5D Mark II works reliably with these newer, faster cards. The firmware file name is 5D200212.FIR and its size is exactly 9,754,668 bytes . This public link is valid for 7 days
Officially, Canon does not support downgrading. However, advanced users have succeeded by using a specially prepared EOS utility or a .FIR file from an older version. This is risky and not recommended. Can’t copy the link right now