The straightforward answer is NO. There is no custom Wear OS for the Samsung Galaxy Watch. Wear OS requires a suitable hardware platform to operate, which the Galaxy Watch fails to provide. Let’s get this straight. To run a high-end graphics game requires a set of hardware requirements to run. It could be eight gibs of RAM, the latest
I know that Huawei is banned from Google services, but maybe the enduser/consumer is free to hack it to install WearOS. Kind of like sideloading the Google Play store onto the Amazon Kindle Fire. No. There are no custom ROMs for smart watches. Not entirely true, but for Watch 3 - sadly - it's true. : ( hope there will be rom's in the future.
Just check my YT channel. Updates every 1-2 weeks, constantly adding new things. Also few days ago made it compatible with Tizen OS (older Galaxy Watches). So yesmy time costs, who likes and want this app will take it, because $.1.45 is almost nothing.

Advanced Set up. 1. Install the Tizen Studio. At first, download and install the Tizen Studio according to the instructions on the Tizen Developers site. In the Package Manager of the Tizen Studio, install 2.3.1 (or higher) Wearable, Samsung Certificate Extension, and Samsung Wearable Extension packages. Update Manager. Update Manager. 2.

To check for updates for the watch, open the settings on the watch and look for the Software update section. If there is an update available, follow the instructions to install it. After applying any available updates, it is a good idea to enable automatic updates for both the watch OS and the wearables app on your phone.
Currently, this does not work properly on Wear OS 2, but it does work on Wear OS 3, i.e. Galaxy Watch 4/5 and future watches with Wear OS 3 will be able to take advantage of this feature. 3. Using third-party apps (Companion): These types of Apps are not full versions of WhatsApp, they are add-ons that modify and enhance Wear OS notification panel.
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galaxy watch 3 wear os hack