Feature Pack 2007 for SP2 : An update that adds advanced embedded features to an existing SP2 installation.
However, you may still find the ISO available on third-party websites or archives. Before downloading, consider the following: Windows Xp Embedded Sp2 Iso Download
Adds support for Software Update Services (SUS) and Systems Management Server (SMS) for remote updates. Windows XP Embedded SP2 ISO Download: An Overview
Microsoft killed Windows XP Embedded not out of malice, but because the security landscape of the 2020s is unrecognizable compared to 2004. If you need to keep legacy hardware running, isolate it on a separate VLAN with no internet access, and never, ever rely on a downloaded ISO from an untrusted source. The Risks of Downloading a Pirated XPe SP2