Update upgrade.md

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aiminick 2019-02-11 01:39:51 +08:00 committed by GitHub
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@ -31,7 +31,7 @@ apt update ; apt install tar gzip zip unzip bzip2 xz-utils -y
> 如:***upkg-201X-0X-XX-v201X-1.X-uX.zip***
* 上传到你的树莓派系统,解压这个升级包
* 上传到你的树莓派系统,**切换至root用户**并解压这个升级包
```shell
unzip upkg-201X-0X-XX-v201X-1.X-uX.zip