You will probably kill the motherboard.

Very high.

Soldered RAM is BGA (ball grid array) — tiny balls of solder under the chip. Removing it cleanly requires a professional hot air rework station and a steady hand. One slightly-too-hot pass and you lift pads or cook neighboring components. Even experienced repair shops consider this risky.

Then you have to solder a new chip with exactly the right firmware and timing. If the laptop doesn’t detect the new RAM, or the BGA joints are poor, the board is dead. No recovery. No “just put the old one back” — you already ripped the pads.

It’s not like a desktop DIMM swap. It’s microsurgery on a multilayer PCB.

Better to buy a laptop with enough RAM from the start.