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nope, this is not as simple as that. It looks like upgrading to 5.4.0 does modify the bootloader, and then reverting back to the stock firmware is not an option anymore

Ok, I have a 2CD-2032F-IW. It was running probably 5.3.0. I didn't know about chinese or us or european version, and did try to update to 5.4.0. Stupid idea!!! . So after spending a lot of time, I know I have the chinese version.Now if I try to tftp 5.3.0, it says success for firmware update...

I would be glad to have this downgrader too, last resort for me, spent hours,nothing working, so the bin has never been that close for my cam