Samsung Gear 2 (samsung-rinato)
|CPU||Dual-core 1.0 GHz Cortex-A7|
|Non-Android based device||✔|
The Samsung Gear 2 originally runs Samsungs Tizen operating system, which is based on Linux.
How to enter flash mode
If your Gear 2 is not linked to a Samsung phone, you have to bypass the first screen. Click around 20 times on the watch symbol until the Bluetooth message pops up, then wait until it disappears and then long press the watch symbol once. See this video.
Long press the power button to force a reboot (the regular restart button does not work for accessing the menu), then press the power button quickly multiple times to go into the boot menu. You can navigate to downloading mode by pressing the power button and then waiting a few seconds.
The device has mainline support, added by Samsung. See here