Unroot Dolamee D5

[gsh]

I've joined this forum as you seem to have some very knowledgable folks here and hope someone can help.
I have a Dolamee D5 Android box and need to find a way to completely unroot it. In its current state I cannot play any of my digital titles from Sky Store or Flixster as they do not work on rooted devices.
Is there a way to do this successfully?
I have found a few generic android unroot tutorials online however SU does not appear to be installed.
The second method here

http://www.androidauthority.com/how-to-unroot-android-phone-tablet-652905/

also doesn't work - busybox will not uninstall from ES File Explorer and I cannot find su in either bin or xbin and can find no sign of the su apk.
I assume I'm doing something wrong so if anyone can help I'd appreciate it.

[dka925]

One way is to do this from the Firmware Image.
Or you can do is use ES File Explorer and delete under
system/xbin the following files:
su and daemonsu also sud when it is there.
Also Superuser under app or private-apps

Neomode

[gsh]

Thanks for the reply.
I only have daemonsu.old and it can't be deleted.
There is no su or sud and no Superuser in apps or priv-apps.

[neomode]

Ok let me see to find the Firmware and unroot it for you.
Then you can Flash to your Device.

Regards
Neomode

[gsh]

That would be great if you could. I shall do some research on flashing now!