X96 Firmware Downgrade

[escaflowne]

Hi,

I buying several x96 Android box,
but not all support APK belong to my client,

after tracing the issue, i found that's the firmware version for the unsupported device different with the supported device
unfortunately, the supported device using older firmware than the others.

the supported device using firmware version from 2016
and the unsupported device using firmware version from 2018

So, Could i downgrade firmware version from 2018 to 2016 ?
coz already try the firmware from the link below

https://www.entertainmentbox.com/x96-tv-box-android-marshmallow-6-firmware-download/

but i always got this message

"Cant install this package (2016 ??????????) over new build (2018 ???????) "

So how to solve this issue ?

Thank you