How to downgrade Nougat 7.0 to Marshmallow 6.0 for Zenfone3?

Can any give solution here? Or do i need to find in xda developers?

Agreed... very frustrated that I had a great working phone for about a month, until ASUS pushed the Nougat update. Now I want to throw the phone out the window as it is so slow. It seemed in early July that they were working to fix the problems, but now no updates in a while.

Asus should provide a easy way to revert to the software we purchased the phone based on. We should have a choice to use the phone as it was out of the box.  Imagine if you buy a car with a 250 HP V6 engine, and a month later the manufacturer "updates" it down to a 150 HP 4 cylinder. Most would never buy from that manufacturer again. (Maybe I'm a little extra cranky today because my 2-year old Asus C300 Chromebook just had the infamous "white-screen" SSD failure, and there appears to be no means to replace just the SSD, so I now have to buy a new Chromebook.)

Download official rom from asus website which version you wants now flash your device by asus flash tool 

I can't do that to my phone...

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I have a brandnew zf3 max 5.5 updated to nougat 7.1.1 and it cis me tons of problem. Corrupted my sd card, apps continuously hangs, mp3 songs on sd card can only be played using google music, 3rd party mp3 cannot recognize contents of sd card, cannot select sc card as storage of pic and vids to name a few. If you would dowmgrade to mm yo would need to go to their service center to keep warranty valid. Im only begining to count how many i am having and how many more shall i encounter

Download your friemwere in .raw  which versionyou wants now download asus flash tool now install it and make your pc driver verification is disable now load the frimwere in flash tool now click start then boot your phone in cdc mode if have otherwise recovery mode come to fastboot now connect your device it will start flashing your device  once its all done then disconnect your device and power on. It will be in that version you downloaded earliernow enjoy your downfraded version

I just bought my zenfone a month ago now i regret it why did i ever upgrade it to nougat.... can anyone know how to downgrade it ro marshmellow...

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I tried downgrading my zenfone 2 laser from MM to L and i experienced some problems but after clearing data, It worked fine. I think the proccess goes the same on N to MM.but I never tried it to my zenfone 3 max 5.5. I suggest you should not try.

Same problem here . Any solution of downgrade to MARSHMALLOW.