If you kindly have any tutorial links -usage -etc. that would be swell

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I haven't tried...yet.
Sorry, the information I gave is for those who can't access Coreelec.
Follow the step by step that I have here, which works, in my case.
1. Created an “overrides.xml” file with this content:
<?xml version="1.0" encoding="UTF-8"?>
<overrides>
<override action="RebootToAndroid">
<action>System.ExecWait("/usr/sbin/rebootfromnand")</action>
<action>XBMC.Reboot()</action>
</override>
</overrides>
2. Copied it within the “userdata” folder
3. Went to “Skin Settings -> Miscellaneous -> Customize shutdown menu” and added an item with the label “Reboot to Android” and this action (without the quotes): “RebootToAndroid”
On the Estuary skin, you already have this command Reboot to nand/emmc.
Starkman credits
This might be helpful to some people: In case someone uses skins that use “skin shortcuts” (such as Eminence 2, Nox 5 Silvo, etc) there’s usually no DialogButtonMenu.xml or any other related file to edit that would have the result we want. Usually, though, these skins have the option to go to...
discourse.coreelec.org