[E_g_o_r]

@Trixster  @Smultie I used to be a regular user of LibreELEC dev updater addon to update every day Milhouse Nightly builds.  But honestly since libreELEC now has an update facility built into libreELEC settings option, there is absloutely no need to use Liberelec Dev updater addon anymore.

Have you both tried as its working well now even though not fully automatic?  Read Note 7 in Millhouse's 1st post in this thread + take a look at my post Here which provides recent image of required settings altered for RPi3 B+

Remarks:
1. LibreELEC dev updater more handy to use - it can download updates in background, has a few nice settings like backuping and turn off overclocking. It can show comments for each available update.
2. Built-in feature to setup custom update channel is buggy - path is case sensitive, it cannot retrieve channel for me if I wrote "rpi2" instead of "RPi2"