For downgrading firmware a factory reset is usually recommended. To go from 3.x.x to 2.6.1, it is definitely needed. I don't know what could be causing the problem unless there was something in the files you restored. I have done this recently and had no issues with my Touch and 2.6.1, but I just resent books rather than restoring anything.
Quote:
Originally Posted by ashadul
Note that I downgraded because of calibre management of shelf wasn't working in v3 firmware and I very much love this feature.
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Calibre works with ALL released firmware versions on the Touch on all Kobo e-ink based ereaders. I am using it with 3.3.0 on both my Touch and my Glo. And 3.2.0 on another Touch. If you have a problem with it, please report the problem so that it can be looked at. In this case, my bet is that it was a configuration issue or a corrupt database, not an actual fault in calibre or the driver.