This is the full video guide, it begins after i tried to open it from the back. The device should be open from the screen.

Heat the device to 110C for 2-3 minutes.

Pry the sides of the device carefully (or not if your screen is shattered) . There are 8 plastic tabs holding the screen to the frame, with a little glue in each tab. The top tab is a big tab, so you must begin from the bottom.

Disconnect the LCD ribbon connector in the middle of the frame and you can separate the LCD from the frame. At this point you can put a replacement LCD .

Top view of the device opened, the battery is soldered with a little of conformal coating on top of the pads.

Back view of the device, The part as identified:

ES9018Q2C DAC

ICN6211 MIPI LCD controller

Exynos 7270, this is a highly integrated chip for wearables, It includes the normal Samsung SOC characteristics, with stacked DRAM & eMMC integrated into the package. That is why the PCB don't have any DRAM or storage chips around.

I removed the backplate, but for LCD or battery replacement is not necessary. The battery was glued to the back and there is an antenna on the top .

Battery Detail.

Manufactured by SUNDA.

3.7v to 4.2v

1200mAh

624736 pouch form factor