I've made script that's on every boot changing default USB mode to UMS.
On USB plug it mounts your External SD (doesn't matter if you have swapped IntSD with ExtSD or not )
Method 1 - init.d script (recommended)
L9-USB-Mass-Storage_fix___mateo1111.zip (221.4 KB)
- init.d support (you can easy enable it with this app: Uni-init v1.0.apk - see original thread)
- Flash .zip using CWM
(Select "No" in CWM while rebooting.)
How to remove the script? Just delete /system/etc/init.d/30ums.