I have a sony Xperia M (C1905). Till some days ago I have the old android release with rooted access and link2sd. All worked good.
With the last 4.3 update I had some problems, since I'm not an expert android developer . However I managed to root my phone using the haresh311999 guide.
I have my phone rooted, checked also with Root checker. I've also SuperSu, BusyBox and Link2Sd app. I've enabled the debug mode and checked the MSC storage mode.
But in Link2sd I cannot mount my external partition in which I used to link all the bigger apps. I've an ext3 partition and before the 4.3 upgrade it worked good. Now If I try to rebuild the script I got an error:
Mounting script cannot be created (This string isn't the original one, since I'm not english).
"mount: Operation not supported on transport endpoint"
adbd can't run as root in production builds
$ adb shell
# mount -o rw,remount /system