Something is off then.

If you cloned properly ...

When you plug in the charger from a device "off" state...
with the n800 n810

what should occur is the boot screen should pop up to give you the choice of the internal onboard os or the cloned sd card os
as option before timeout.
then it goes to a proper "charge" state and portrays info depending upon which of the two os's one has initiated .

Just fiddling with the bootmenu and everything "seeming" to run ok...
does not equate to a certainty that you have done steps along the way properly.

If you did anything other than my suggested...I cannot guess where or what you did...or if you did whatever ...correctly.
At a guess...if charging is screwed up...
then you did not do something correctly.

If you did the suggested method I advised ...from beginning to end... then you have a device performing properly.
It has been used by many.
It works
Every time.
I use it myself when it is time to reflash a n8x0 ....years later...
when I couldn't be bothered to commit to memory the totality of the process.
It just works.

and IF that doesn't work...you are omitting something ...
then I would suggest documenting exactly every keystroke and every step with documented results.
quickly we could figure out where issues lie....and remedy them immediately.

Trying to troubleshoot in the dark...considering god-only-knows-what-you've-done ...as far as which method of installation instructions....
running with scant info ..
concerning what I understand so far as ...
an improperly installed os...and an attempted hack on top of it hoping bootmenu is "fixed" ...

all that...

Doesn't work for me...

I really do like to help...
But time is a luxury I have little of currently to spend on.
I already spent a ton of time doing the complete and total newbie, idiot-proof, you-can-be-half-asleep-doing...walkthrough and companion video ...

The only time one would deviate from the prescribed walkthrough is to do some research and testing of various firmwares ...older than diablo...say..


I suggest...
start over
Do it again.
From beginning to end.
then you know you did everything right...or somewhere went wrong...and it can be sorted out.

You won't break your device.
and it won't hurt to learn more about how everything works...and get practised at it.