移动的机顶盒不能安装第三方软件的解决步骤如下：
1、首先准备好一个U盘，并提前在U盘里存储好要进行下载的第三方软件的安装包。
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2、接着将此U盘插入到中国移动机顶盒的背面的USB接口内。
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3、接着在电视的页面上就会出现有“已检测到外接设备”的提示框，在此框内点击下方的“安装包”。
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4、接着在此页面内点击要进行安装的第三方软件。
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5、然后在弹出来的对话框内点击“安装”按钮，等待安装的完成就可以使用此软件了。
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