I have a Energy Sistem with Android 4.3. It's OK but I found apps run slowly and some apps require a newer version of Android. It has been replaced with a jali

I have a Energy Sistem with Android 4.3. It's OK but I found apps run slowly and some apps require a newer version of Android. It has been replaced with a jalibroken 2019 Kindle running Koreader. This is now the best ereader I have owned. Reads many formats, lots of customisation and has a Wallabag client for reading long form web articles. I have paired this with Calibre on my laptop for managing my library.