Opening the shell is the hardest part here, and it's difficult to separate them.

I've used jimmy and hot air gun to soften and slice trought the adhesive.

After cracking the shell you have access to the touch screen ribbon and the OLED screen.

Use a spudger to unclip the Hearth rate and the touch screen sensor ribbon

Unscrew two Philips PH00 screws at the bottom and use the spudger to lift it up.

Next remove the mainboard with the battery. Battery isn't glued to the chassis so it's easy to lift up.

Use spudger to lift the orange clip at the bottom and take out the ribbon with tweezers.

Next to pty up the screen use the haliberd spudger to cut trough the adhesive under the OLED.

Use Jimmy to pry up the hearth rate sensor and gently remove the vibration motor using tweezers.

To remove the battey you need soldering iron the - terminal of the battery is marked on the mainboard

Dialog 14683 Main chip

25LQ32 32 Mbit flash

Azoteq OLED controller