There are a few.. However I bought Synthesia as even key lighting works there, and the android costing was quite reasonable for the features it offer..
https://www.casiomusicforums.com/index.php?/topic/19328-how-to-connect-to-chordana-play-app-with-non-supported-phone-via-usb-midi-android/
Follow this post.. should help out..
Hey.. I posted this a few days back, only that mods moved it to iPhone section which Android users won't usually enter..
https://www.casiomusicforums.com/index.php?/topic/19328-how-to-connect-to-chordana-play-app-with-non-supported-phone-via-usb-midi-android/
P.S. I don't own an iPhone, so can't share any info on it..
The certain screen that says, turn off display cord names when left and right hand is on.. that screen, there's a faint mute button..
Mute the one that says, L for left hand..
I don't know how to get the pop up though, other than enabling everything and let it show me the screen..
Facing the same issue.. Will try buying another adapter.. I have a micro usb port on my phone.. Trying to connect to LK-S250.. To PC it works fine, but didn't work on any phones (both type c n micro usb)..
Worked with some efforts.. WIll be posting about it..