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I have 1.2.3 but as almost every guide recommends I downgrade to 1.1.3 and then apply those steps, and I don't put any other files, but the camera just doesn't see the bootflag, it keeps telling me there's no update file :/

In that guide,  the update (with the bootflag.fir) has to be with the original 1.1.3 firmware for 5D3?
I'm using that 1.1.3 official firmware and following the guide religiously but my camera keeps telling me there is no file to update once I try with the bootflag.fir file copied to the root of my sd card.

Hello,

I've been trying to install ML on my 5D3 for 2 hours now and everything goes perfectly until I have to copy the 5D3-113-bootflag.fir. Once I have prepared my sd card with macboot properly and put the ML, autoexec.bin and the bootflag files in as indicated in so many guides and putting the card in the camera I move to the update menu and push "ok" to update, but it gets error over and over telling me that there is no update file founded and that I should check my memory card and battery?

Any help guys?

I'm seeking to install ML in my 5D3, is buying a 1000x CF card the only option for raw??
isn't it possible with my lexar 90mb/s 64Gb Sd card? :/

Thanks!