Online GBA SP serial number check tool
Here are two useful finds for original Nintendo hardware.
For Nintendo DS: DSPico flash cartridge with USB-C.
For Game Boy Advance SP: an IPS-ready eXtremeRate replacement shell.
This script determines whether the Game Boy Advance SP label has the correct serial number.
To start, enter the serial number of your Game Boy Advance SP console in the form and click Check.
Only works for consoles with labels for the American (starts with XU) or Chinese (starts with XQ) markets.
Works for both versions of the Game Boy Advance SP: AGS-001 and AGS-101.