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Old 02-23-2026, 02:31 PM   #7
dmitryshura
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dmitryshura began at the beginning.
 
Posts: 7
Karma: 10
Join Date: Feb 2026
Device: Kindle 3G
Quote:
Originally Posted by dmitryshura View Post

Amazon registration problem (after reset)
After factory reset I can’t register the Kindle back to my Amazon account:
  • Amazon sends a one-time code valid for ~10 minutes, but the Kindle rejects it.
  • Entering password+code combined also does not work (I know this workaround exists for some old Kindles, but not in my case).
UPD (Amazon registration / OTP issue solved):

Turned out it was not a Kindle problem. Registration was failing because of my home network DNS/security filtering.
I had “secure DNS” / DNS filtering enabled in my network, and for some reason it was breaking Amazon authentication for the Kindle.

Fix:
I created a separate Wi-Fi network routed through a VPN to my datacenter (clean DNS / no filtering) — after that the OTP started being accepted and the Kindle registered successfully.

What worked for me step-by-step:
  1. Enter email + password on the Kindle.
  2. It shows a login error.
  3. Then an OTP arrives to my email.
  4. Without entering anything on the Kindle, reboot the device.
  5. Try to register again, but enter the OTP instead of the password.
  6. Kindle registered.

So if anyone is stuck with “OTP not accepted” on an old Kindle, check your DNS/adblocking/secure DNS filtering.
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