Amazon e-reader “LightIt turned out that the older models in the series will not be able to connect to the Internet from December 2021.

AmazonSmile Help: 2G and 3G E-Reader Network Support FAQs
https://smile.amazon.com/gp/help/customer/display.html?nodeId=G7H6AASHTERXBKNV

Amazon’s Oldest Kindles Will Start Losing Their Internet Access In December – The Verge
https://www.theverge.com/2021/7/28/22598747/kindle-3g-network-shutdown-e-readers-no-internet

Information about Kindle is described in Amazon help, and according to news site The Verge, there was a notification email from Amazon.

The content of the announcement is that the American telecommunications company will terminate the 2G / 3G network in December 2021 due to the transition to 4G / 5G, so the terminals using the 3G network will not be able to connect to the Internet. If your device supports Wi-Fi, you can continue to connect to the Internet through a Wi-Fi connection.

Devices that can only connect to the Internet via Wi-Fi are Kindle Keyboard (3rd generation), Kindle Touch (4th generation), Kindle Paperwhite (4th to 7th generation), Kindle Voyage (7th generation), Kindle Oasis (8th generation) generation). etc.

And the terminals that cannot be connected to the Internet are Kindle (1st and 2nd generation), Kindle DX (2nd generation), etc., and since new Internet content cannot be obtained with these terminals, after December 2021, there is no choice but to transfer with a MicroUSB cable.