BOOX Firmware V3.5.3: New Features and Upgrades
shop.boox.com
BOOX Firmware V3.5.3 brings a brand-new UI, Dark Mode for reading, FreeMark, AI Assistant, and BOOXDrop Screen Mirroring.

My Boox Page just got this tonight. Main new feature for me is that they added dark mode to the stock Neoreader app.