To update an existing Minecraft: Pocket Edition (MCPE) server, simply follow these steps:
- Select the version of PocketMine you wish to download at pocketmine.net
 - Click the "Phar download" link, and download the .phar file
 - Rename the downloaded .phar file to "PocketMine-MP.phar".
 - Connect to your Minespan server via FTP.
 - Upload your PocketMine-MP.phar file to the "/pocketmine" folder on your server, overwriting the existing PocketMine-MP.phar file.
 - Login to the Multicraft panel at http://panel.minespan.com/
 - Select your server.
 - Press "Restart" at the top of your server page to restart your server.
 
After following these steps, your Pocket Edition server will have been updated!