You will lose your warranty.

Yes, almost certainly. Sending your laptop to a third party for a soldered RAM upgrade means you’re breaking the seal, and the manufacturer will consider it a modification. That voids the warranty instantly.

Most companies (Apple, Dell, Lenovo, etc.) are clear: unauthorized service or alteration of internal components = no warranty coverage. Soldered RAM isn’t meant to be touched after the factory. A third-party shop is taking a hot air station to your motherboard. That’s not a user-serviceable part.

If something goes wrong later — even a completely unrelated issue like a dead battery or a failing fan — the manufacturer will likely point to the modification and refuse service. You might get lucky with a lenient rep, but don’t count on it.

Also, the upgrade itself can go wrong. BGA rework on a laptop motherboard is tricky. If the shop lifts a pad or overheats a nearby chip, you’ve got a brick. No warranty covers that, and the shop probably offers limited or no guarantee.

Bottom line: only do this if you’re willing to eat the cost of a new laptop if things go sideways.