THIS IS A WORKING METHOD IVE DONE IT TWICE
i have a htc desire 510 to uninstall com.system.patch
1st.download 360 security (you can uninstall it after)
2nd make sure it is s device admin (settings->security->device admins) turn on 360 security but also you will see Com.System.Patch there Do Not Try to do it this ways then the virus knows you are attacking it.
3rd go into airplane mode
4th Restart your phone
5th go into 360 security and go onto app manager and hit delete in com.system.patch
6th on the popup saying This is a device admin then hit deactivate then hit deactivate again
7th if you press the button and it doesn't work then restart and do it more time (from 3rd step)