Revert Linksys EA8500 router back to the official firmware from OpenWrt

Hi everyone,
I got a used linksys EA8500, and its running openwrt. I want to revert it to the original firmware but im not able to.
I have downloaded the official firmware then ssh to the openwrt then i used sysupgrade -n -v -F command,the route reboot and never boot up again. I had to turn it on and off 3 times to have it back to openwrt. Any advise, please

I have not done this but as you need to install firmware 1.1.4.169978 to flash openwrt
if makes sense to use this version to go back then upgrade to current after
tho there is differences between US and non US versions
I have had to flash the factory image via sysupgrade without keeping settings and override "21.02 to 22.03"
I imagine this is how you would do it at lest from a current version on openwrt

https://openwrt.org/toh/linksys/ea8500

Thank you for your reply
This is the version 1.1.4.169978 I used
I'm in Canada, im not sure if mine is US or not but i think this version 1.1.4.169978 only available for US

this is the version I used on my version in Australia
to downgrade then flashed openwrt so it was at lest excepted

there is this comment that I'm unsure if it's meaning tho
some users have reported that 1.1.4* versions do not boot, so installing a 1.1.3* firmware may be needed

as your is not booting maybe try 1.1.3

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Thank you so much for your help
I got it back to the OEM firmware
I used 1.1.3.166845

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