I installed the KePub Output driver.
I removed the badly formatted kepub from my Kobo device.
I then sent the epub from Calibre library to my Kobo.
Unfortunately, when I view the kepub in the calibre viewer, the formatting is still as messed up as before.
Are you sure I don't have to disable KoboTouchExtended as a whole, or turn off some options in it?
Update: Even when I disabled KTE, the kepub in the Kobo reader is still messed up.