Replacing soldered RAM voids the entire laptop warranty.

Yes, it voids the whole thing.

Manufacturers treat soldered RAM as a permanent part of the motherboard. If you desolder and replace it, you’ve physically altered the board. That’s a textbook warranty violation—most policies explicitly exclude damage from modification, tampering, or unauthorized repair. No one is going to honor only “the motherboard” portion and still cover the screen, keyboard, and battery. The entire laptop is dead to them.

Also, it’s risky. You’re desoldering fine-pitch BGA chips on a multilayer board. One slip and the laptop is a brick. Even if you succeed, you’ve introduced variables the manufacturer never validated. They won’t touch it.

If you need more RAM, buy a laptop with more RAM from the start.