The only way to upgrade to 15.4 beta is reinstalling with ISO. But the 15.4 RC is coming soon and you could upgrade your Deepin OS with apt
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myTTYY
deepin
2017-03-17 07:00
#4
I'm sorry.System can only be reinstalled ! Deepin 15.4 is beta,but the official version of the system will soon be released.Perhaps the RC version can be upgraded
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司南
deepin
2017-03-18 00:28
#5
Waiting......
Formal version in March ..or April
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krmts
deepin
2017-03-23 08:38
#6
Take a look at this link. At the end it shows how to upgrade.
Add this repository and update : deb http://proposed.packages.deepin.com/update-test unstable main non-free.
I did it and I'm on 15.4