With these instructions you can delete pre-installed apps. Okay, in fact the apps are not deleted. It only removes the apps from the data partition. But they disappear from the Appdrawer and no longer take up any storage space. They also disappear when the watch is switched off; they are only restored by a factory reset. Or just a flash of the firmware.
Please note: Even if I think that something cannot really be destroyed on this way: You do this at your own risk. I am not responsible for any damage.
Download Minimal ADB and Fastboot: -Minimal_ADB_Fastboot_v1.4.3 (1).zip - Google Drive
Download tutorial:-Ho to delete installed Apps.pdf - Google Drive