Changing Software Of Cheap Smart watches

Hello tyerebeveryone so as many of you may knwo or own watches like the various makes of the dz09 and others have the same software and Samsung s look withbslight differences like icon style and background.this makes my wonder how hard itnwould be to change the software because if the various company's can add backgrounds and watch faces why can't we.I have no knowledge of coding so I'm entrusting you the community to figure out how to mod these watches. A lot of them have micro SD slots and micro usbs to transfer data or hacks to change them and a lot of the ones with SD cards have a file browser so I can't imagine its that hard tomuse the file browser and explore the watches root directories the software isn't open source though so get creative I guess

GOod luck!!!