Check a teardown video.

Start with a teardown video. Manufacturer specs often bury the answer or use confusing language like “onboard memory” vs “upgradable.” A five-minute video of someone prying off the back cover will show you exactly what you’re dealing with.

After that, look up the official service manual if you want confirmation. But the video is faster and more honest. If you can’t find a video, it’s probably soldered.

Future you will thank past you for checking before ordering RAM sticks that don’t fit.