I just want to share my new sperience with Litchi AND DJI GO 4 on a Sansung tablet s2 mini. It may help others.
I am not ease to give up. After some searching on the Internet and read lots an lots of posts I start doing my own tests, and now I got Litchi up and running on my Samsung tablet S2 mini and DJI GO 4.
Below I am sending the steps to get it up.
First of all go to How do I turn on the Developer Options menu on my Samsung Galaxy device? and turn on "Developer Options".
Anable "USB debugging" scroll down and anable "Verify Apps over USB".
LITCHI
0.Install Litchi on your tablet
1.Turn on the Phantom 4
2.Turn on the tablet
3.Put the tablet in place and hook the cable from the RC to the tablet
4.Turn on the RC
5.Most likely nothing will happening
6.Reboot your tablet.(cold boot)(Do not turn off Phantom 4 or RC, leave as it is, ON)
7.After reboot, will pop up on screen asking about a USB link. Press OK
8.The Litchi will start on and show a connection with Phantom 4
I test it tons of times
P.S. We can not have DJI GO 4 and Litchi installed at the same "tablet and user".
If we want to have Litchi and DJI GO 4 at the same tablet we have to install DJI GO 4 on another user account.
DJI GO 4
0.Create another account on your tablet
1.Install DJI GO 4 on that account
2.After cold boot, force stop Litchi
3.Change user and start DJI GO 4
4. The magic is done
I hope this help!
I am not ease to give up. After some searching on the Internet and read lots an lots of posts I start doing my own tests, and now I got Litchi up and running on my Samsung tablet S2 mini and DJI GO 4.
Below I am sending the steps to get it up.
First of all go to How do I turn on the Developer Options menu on my Samsung Galaxy device? and turn on "Developer Options".
Anable "USB debugging" scroll down and anable "Verify Apps over USB".
LITCHI
0.Install Litchi on your tablet
1.Turn on the Phantom 4
2.Turn on the tablet
3.Put the tablet in place and hook the cable from the RC to the tablet
4.Turn on the RC
5.Most likely nothing will happening
6.Reboot your tablet.(cold boot)(Do not turn off Phantom 4 or RC, leave as it is, ON)
7.After reboot, will pop up on screen asking about a USB link. Press OK
8.The Litchi will start on and show a connection with Phantom 4

I test it tons of times
P.S. We can not have DJI GO 4 and Litchi installed at the same "tablet and user".
If we want to have Litchi and DJI GO 4 at the same tablet we have to install DJI GO 4 on another user account.
DJI GO 4
0.Create another account on your tablet
1.Install DJI GO 4 on that account
2.After cold boot, force stop Litchi
3.Change user and start DJI GO 4
4. The magic is done

I hope this help!