不能直接在线升级吗
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to update just go to setting and click about fydeos and then check for updates then it should install 
but there display no update
will you can try power-washing your device from the setting but i dont guarantee you that it will work and it will delete all your files android and linux apps. the reason i told you to power wash is because power-washing is mostly used to fix bugs so if you wanna do it and risk it make sure you backup your data. GOOD LUCK 
我也是检测不到更新，有办法手动更新吗
请问你有安装到硬盘吗？如果只是写入到 U 盘而不是安装到硬盘上是不能检查到更新的。
肯定是硬盘上，系统是从4.X一步步升级上来的