Even if the Nook does not automatically download the update you should still be able to update it manually.
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Connect your NOOK to your computer using the USB cable that came with your device. A new, removable drive, named BNTV400, should show up in My Computer. Open the drive BNTV400, and then open the Internal Storage folder within the drive. drag and drop the downloaded file onto the main directory of the Internal Storage folder. Do NOT open or unzip the file. You should not create a new folder on the NOOK drive or add the file to any other existing folder within Internal Storage. Eject or Safely Remove the NOOK drive after the file transfer is complete, then disconnect your NOOK from your computer.
Your NOOK will automatically recognize the file after a few minutes when it goes to sleep mode, and proceed to install the updates.
Please do not turn off your NOOK during the installation process.
Once the installation is completed, your NOOK will automatically restart and go to the unlock screen.
Tap on the small "n" NOOK symbol that appears in the Status bar for additional information. The software has been successfully updated.
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Also make sure your Nook has at least 20% charge although I usually update when mine is a lot higher.
Apache