Follow these steps to find the problem:

Librera Reader is a light-weight and free book reading application that will devour almost any e-book format one can throw at her: PDF, EPUB, EPUB3, MOBI, DJVU, FB2. PocketBook's store doesn't do much for readers in the US. I can already anticipate comments pointing out that it is still possible to strip DRM from some ebooks with Calibre or to persevere. The following tables detail e-book reader software for the Android operating system. Each section corresponds to a major area of functionality in an e-book reader software. Hercules dj control air for mac. The comparisons are based on the latest released versio.

Calibre Pocketbook Collections

Calibre Pocketbook 2

Calibre Pocketbook Inkpad 3

• Make sure that you are connecting only a single device to your computer at a time. Do not have another calibre supported device like an iPhone/iPad etc. at the same time.
• Make sure you are running the latest version of calibre. The latest version can always be downloaded from the calibre website
• Ensure your operating system is seeing the device. That is, the device should be mounted as a disk that you can access using Windows explorer or whatever the file management program on your computer is.
• If you are on Linux and the device is an MTP device, make sure it is not automounted by the OS/file manager as only one program can access an MTP device at a time.
• On Linux, device might fail to mount if after updating kernel system wasn't rebooted.
• In calibre, go to Preferences->Ignored Devices and check that your device is not being ignored
• In calibre, go to Preferences->Plugins->Device Interface plugin and make sure the plugin for your device is enabled, the plugin icon next to it should be green when it is enabled.
• If all the above steps fail, go to Preferences->Miscellaneous and click debug device detection with your device attached and post the output in this forum