I read once all posts and I did not succed
I can not use GS4 + ODAC, the sound is always going thru the speaker not the headphone
I own :
a GS4 unroot, running under android 4.3
a JDS Labs O²+ODAC, modified to receive 2x9V batterries
a OTG cable USB female to microUSB male
a cable miniUSB male to microUSB male
Should I use UAPP or URPP ?
Should I use an other cable ?
Should I root my phone ?
Thanks a lot ;)
go with UAPP
no need to root
try restarting the phone with the amp and OTG connected
check audio settings on phone