Linksys EA8500 - Problem downgrading to stock firmware

First of all sorry for my bad English it is not my firs language.

Ok let`s get on with the problem. I was trying to downgrade from OpenWRT to the stock firmware of my linksys ea8500 because i wanted to install DD-WRT. I did the following things:
1.I went to the OpenWRT website and in search i wrote my routers module and downloaded the
"Firmware OEM Stock URL"
2.I opened my web browser and went to the "OpenWRT" GUI then went to system>Backup/Flash Firmware then browsed for the .img and pressed the "flash image" button and then it said

"The uploaded image file does not contain a supported format. Make sure that you choose the generic image format for your platform."

Someone please thanks.TIA

Ofcourse you readed how to install correctly right here ?

Hello mate thank you for trying to help but from what i`v red is that i need a .trx file to flash the new firmware from the GUI.

You can bypass the image format verification in OpenWrt, by "forcing" the flashing.

In master it works directly in LuCI. In 18.06 you need to use sysupgrade from the command line and use option "-F" to force the flashing despite failing the image format verification.

Note that you need to be sure about the image that you are flashing, as you bypass the normal check...

Hello thank you for your help.I will be very greatfull if you can send me the command for the console because i don`t know how to use it.

You need to download the needed image to the router e.g. by using wget, or by scp or whatever you like.
Save the image to /tmp
sysupgrade -F -n /tmp/imagefilename


And specifically for your device

Thank you for the support.I used PuTTY to SSH in to the router and pasted this command after i logged in(i already had the firmware on my desktop):

sysupgrade -n -v -F /tmp/FW_EA8500_1.1.4.169978_prod.
I also tried:

sysupgrade -n -v -F /tmp/FW_EA8500_1.1.4.169978_prod.img
but in both cases it said"Image file not found".I was logged in as "root" and I am on win7.

EDIT:I also can`t use linux.

Like I said earlier:

Having the image on "your desktop" does not help. You need to transfer it to the router before using sysupgrade

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