According to some articles from BAIDU.com, lots of users do updated deepin v20 from v15, quite different architectures to some degree, but not using a single bash-command line other than that as below:

first of all, have to change the source:

sudo vi /etc/apt/source.list

deb [by-hash=force] https://community-packages.deepin.com/deepin/ apricot main contrib non-free

using # to comment out previous source

and then,

sudo apt-get update

sudo apt-get dist-upgrade -y

finally, other in terminal or desktop evironment, you can see that you have updated to v20.

BUT, THE KERNEL IS STILL NOT UPGRADED!!!!!

so, i think you can take a try where release, and see what if...

The team has developed a tool which helps upgrade from 20.9 to 23 Beta, but many users reported problems with it. Maybe it will be improved after 23 stable releases.