I had ANE2 firmware loaded previously and allowed update to ANG2, which has that limitation on writing to the sd card.
I backed up via Titanium root, and restored back to ANE2 rom.
I have then rooted again via towelroot, and have restored all my apps and data, all without tripping KNOX I'm happy to say.
my problem is that I no longer have the stock sms\mms app (com.android.mms)
the app was there initially but would force close every time I ran it, same for any SMS app I tried
I did get a message like 'cannot downgrade from database 69 to 68) in one of the apps, so I suspect the ANG2 updated the sms database, and now the apps cannot read the new version.
I tried to restore again from titanium, thereafter the app was gone completely!
I tried wiping the app cache and data when it was still visible, no luck.
anyone got any idea on how to get this back without doing a wipe (again!)
I suspect if I could find the database file in the file system I could play around with it, but no idea where it sits on the s5