[Q]How to enable TUN driver in kernel

Hi all,
Ive got android box cx-921 rk3188 not rooted
Ive installed VPN app but its not connecting to servers.
I found out its because TUN driver needs to be enabled in kernel. Ive installed ES file explorer but I dont know where the file I need is located and what is this file name..
Do I need to root my device? I would prefer not to.

Below my only clue so far: (but I havent got init d in etc folder)

"Many custom android rom's have a plain text kernel configuration file which can be used to adjust certain functions within the kernal such as cpu frequencies and in this case the tun driver.

The file can have different names but as far as I know is always located in a root folder called \etc\init.d\
Opening the file with a text editor and changing the option from 0 (off) to 1 (enable), then saving the file and rebooting was all I had to do to get it working."

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