How do update a minecraft PE server 0.9.0?

To update a minecraft Pocket Edition (PE) server to version 0.9.0, first, ensure you have a backup of your existing server files. Download the 0.9.0 server software from the official Minecraft website or a trusted source. Replace the old server files with the new ones, ensuring you keep any custom configurations. Finally, restart your server to apply the updates and verify that everything is functioning correctly.