Quick! Go to your Amazon account’s “Manage Content and Devices” and “Download or transfer over USB” to save the .azw3 files to your computer. Then, follow instructions to set up Calibre with the De-DRM plugin.
Do this before next Wednesday and you might save your Kindle books!
Old kindles are best for this; save books in the older .azw3 format. I’m not sure about newer Kindles that use .kfx
already did like at 2 AM... a friend of mine also tried to do it but it turns out that “Download or transfer over USB” only works if you own a kindle, which he doesn't... so there's that too
Definitely do not tell that friend to head to https://en.m.wikipedia.org/wiki/Z-Library and use one of the URLs listed there to go to that website and find and download a DRM-free backup copy of all the books they have bought and paid for in the past.
You can find your serial number for your kindle in your Amazon account. Forget exactly where but it’s something like “manage content and devices. You don’t need the physical device.
Do this before next Wednesday and you might save your Kindle books!
Old kindles are best for this; save books in the older .azw3 format. I’m not sure about newer Kindles that use .kfx