If your Passphrase is not being accepted you may or may not be receiving this error message: No stored passphrase fits the publication, or the entered passphrase is wrong.

To reach this point it is assumed you have downloaded your ebook to Thorium Reader and used your reading key and the ebook opens without issue. You transfer your ebook to your e-reader device, but when you try to open the ebook on the e-reader you are asked for your reading key / LCP Passphrase and you either receive an error like "Unable to open the book. Please enter your LCP code to open the book.", or the screen just refreshes and you are asked for the LCP Passphrase again.

This can be caused if your e-reader is using an older LCP Profile (like 1.0), while we are using the newer LCP Profile 2.9. The newer LCP Profile went live in January 2024.

To resolve the issue please update your e-reader to ensure it is using the latest firmware version. This should mean it updates to the newest LCP Profile and your reading key / LCP Passphrase will be accepted and the ebook will open on your e-reader.

Some e-reader models no longer receive firmware updates, or are unable to support an LCP Profile higher than 1.0. Below is a list of e-reader devices by manufacturer showing which support  LCP Profile 2.9 (but may require a firmware update), and which unfortunately will not work. If your device is listed under those devices that cannot support the newer LCP Profile, if possible please use Adobe Digital Editions (ADE) to transfer the ebooks to your device instead.

PocketBook Reader devices that support the latest LCP Profile:

PocketBook Reader devices that aren't supported:

• InkPad Color 2
• Basic Lux 3
• Touch Lux 4

Any PocketBook Reader device not listed here we would assume to not be compatible, unless it is a newer product, in which case it should automatically be compatible.

Tolino eReader devices that support the latest LCP Profile:

• Tolino Shine (5th Generation)
• Tolino Shine Color
• Tolino Vision Color
• Tolino Flip

Tolino eReader devices that that aren't supported:

Any Tolino eReader device not listed here we would assume to not be compatible, unless it is a newer product, in which case it should automatically be compatible.

Other devices

If you have a device that was not listed above, but the manufacturer says is compatible with Readium LCP and you are receiving the error please also try a firmware update. Unfortunately we do not have a complete list of compatible e-readers. If your device doesn't appear to be compatible, but is compatible with Adobe DRM, possible please use Adobe Digital Editions (ADE) to transfer the ebooks to your device instead.

If you have no available firmware updates, or updating does not resolve the issue, please complete our support form to submit a ticket to our customer support. If you are receiving an error message please take a screenshot and send it to us. Please also include the make and model of your e-reader device and the firmware version currently installed. We can then investigate further.