The ability to unlock books copied from a Kindle depends heavily on the age of the device and the firmware version installed on it.
Books with a .azw or .azw3 extension can be handled using calibre along with the proper DRM removal plugin. However some of those are likely to be things like free dictionaries.
Books with a .kfx extension are problematic. They can only be handled if they were downloaded by a Kindle running firmware version 5.12.1 (released July 2019) or older. Anything newer than that uses DRM that cannot currently be removed. This situation is unlikely to change in the foreseeable future.
Your best hope is to try to get Amazon to restore your account, assuming that it was a mistake and you didn't violate any the the rules previously mentioned.
Added: Also I assume that by "Kindle" you mean an e-ink Kindle device and not a Kindle app or Fire tablet. There is no hope of recovery of DRM protected books from either of those.
Last edited by jhowell; 08-02-2022 at 10:41 AM.
Reason: corrections and additions
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