我的也是r5，也是无法进入安装界面。

Prepare the bootable usb as a DD (Disk image) instead of an ISO usb, that's how I could boot the installer. Update your BIOS if possible. Also, if you manage to get deepin up and running install the latest stable kernel (http://kernel.ubuntu.com/~kernel-ppa/mainline/) and amd graphic drivers,(https://people.freedesktop.org/~agd5f/radeon_ucode/). Usually the command "update-initramfs" might tell you what graphical drivers you are lacking, like vega10, vega m and vega 20.

Unfortunately I couldn't activate the graphical effects and sometimes you won't be able to control screen brightness. We might have to wait for Deepin 15.8 instead.