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There are just too many variants.
We need a user tool to check 'this is compatible/usable with my device'.
Just look at the KFX hoo-ha that non-Kindle users deal with .
Look at how many K3 and before are still in use . Or how many brands are gone with no possible FW update from early ADE.
Not everyone wants to bin (or can afford to), an old model, let alone deal with the DRM induced consequences on their older purchases.
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