The answer to this question is a little complicated. In general, you can continue to use your old Nook if it is still working and has a battery. However, there are some specific things you need to know about the new Nook. If you have an old Nook that is not compatible with the new operating system, you will not be able to use it. The new operating system requires a newer model of the Nook. If your old Nook is not compatible with the new operating system, you can try to find a used one or buy a new one. If your old Nook is still working and has a battery, you can continue to use it as long as it has at least 8GB of storage space and an updated version of the Kindle app installed. You will need to update your Kindle app if you want to use features like Whispersync for Voice which lets you read books on your Kindle and have them automatically appear in your Audible account so that you can listen to them when away from home. ..