Firmware versions in the x.3.x series (currently only affecting 5D3) won't let you downgrade to a prior series. In other words, you can go from 1.3.4 to 1.3.3 but if there is a 1.2.3 or a 1.1.3 firmware on your card you'll get this message: It is not quite that easy with some of the latest Canon firmware updates. Canon released a series of Firmware update for Canon 5D Mark III, 60D and astrophotography camera 60Da, See more details and download links below. Firmware Version 1.1.3 incorporates the following improvements and fixes. 1. Supports the single focal length EF40mm f/2.8 STM lens that is to be released at the end of June, 2012. 2. Firmware Version 1.4.0 is for cameras with firmware Version 1.3.3. Canon Experience Store Test, try and buy all the latest Canon digital cameras, lenses, and printers. My 5D Mark IV is urunning firmware Version 1.0.4. I searched Canon support and found 7 firmware downloads from Version 1.0.2 dated 9/26/16 through Version 1.4.0 dated 5/18/23. - Why is there no download for Version 1.0.4, the Version running on my 5D? - It is my understanding that I must update my 5D with each firmware version download, each Detail. Firmware Version 1.3.0 incorporates the following enhancements and fix: 1. Enables NFC connection with smartphones running Android 10 operating system. *For Android running v6.0 or later, use Camera Connect v2.7.10 or later. *For Android running v5.0 or older, use a connection method other than NFC. 2. How to downgrade 5D Mk III 3 firmware from 1.3.6 to 1.2.3 Magic Lantern (steps in description) comments sorted by Best Top New Controversial Q&A Add a Comment apollo767 • • Edited Canon EOS 5D Mark III firmware version 1.3.5 incorporates the following fix: 1. Fixes a phenomenon in which standard exposure may not be obtained, or an irregular exposure may result, when Silent LV (Live View) shooting with the following TS-E lenses: TS-E 50mm f/2.8L MACRO, TS-E 90mm f/2.8L MACRO, or TS-E 135mm f/4L MACRO. 5D Mark III 1.1.3 Canon Firmware Version: 5D Mark II Canon Firmware Version: 2.1.2 Latest Build they are available for download either here or in the forum. Changes in Version 1.3.0: 1. Enables NFC connection with smartphones running Android 10 operating system. *For Android running v6.0 or later, use Camera Connect v2.7.10 or later. *For Android running v5.0 or older, use a connection method other than NFC. 2. Enables support for the .CR2 image file format on image.canon. 3. EOS R6 Firmware Update Version 1.8.3. Firmware Version 1.8.3 incorporates the following enhancements and fixes. 5 December 2023. ZFRSgE.