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For bug reports, please be sure to include:
The model of your device
The firmware version of your device
Your calibre-sync.ini file (but be sure to remove any passwords or other personal data first)
If possible, the /etc/calibre-sync/calibre-sync.log file from your device
You can see the firmware version of your device by tapping "Device Information" in the Settings menu. You can tell which device you have from the "About [device]" option in the settings menu, for example, "About Kobo Touch". If still unsure, see this link