But after unscrewing the four back cover screws from the Apple Watch Ultra, Derek Wise quickly discovered that there was a very small O-shaped waterproof glue around each screw, but when you want to restore it, you can hardly recover it perfectly.

As the first batch of Apple Watch Ultra was delivered to customers, Derek Wise of 9to5Mac also shared the initial disassembly video. just after opening the back cover, he advised ordinary consumers not to easily try further disassembly. The main reason is that doing so will undermine the warranty and waterproofing of the watch. In addition, there is a cable connection between the back sensor and the motherboard, so you need to be more careful when scraping the entire waterproof rubber ring with a knife.

(from: 9to5Mac)

As shown in the figure, there are four P5 screws on the bottom of the Apple Watch Ultra, similar to the one on the bottom of the MacBook notebook.

Although not as common as flat heads or Phillips screws, it is still quite common in various multi-purpose screwdriver head kits.

However, after unscrewing the four back cover screws from the Apple Watch Ultra, Derek Wise quickly discovered that - each screw has a very small O-shaped waterproof glue around it, but when you want to restore it, you can hardly recover it perfectly (it is easy to slide out when tightened again).

Then came to the more dangerous scraper link. Derek Wise knew clearly that doing so would cause the waterproof properties of the Apple Watch Ultra to be damaged, but to find out, it used a spudger and a thin gasket to separate the ceramic back cover from the titanium case.

"open the cover" to destroy the waterproof rubber ring, you can see two tiny cables - which are used to connect various health sensors with the battery, screen, motherboard and watch body - but Apple still hides more secrets under the internal metal guard plate.

Interestingly, after removing the three fixing screws on the guard plate, the Apple Watch Ultra did not immediately show any prompts, but the connection and communication with the phone have been affected - it can be seen that there are multiple cables connected to the other side of the watch, and there seems to be no good way to break it further.

Derek Wise speculates that the other side of the Apple Watch Ultra may have been fixed with adhesive, but decided to stop there and gradually restore it. After all, it is obvious that it is safer to leave it to institutions such as iFixit.