You are right, TP-Link has published two firmware files with the same version number 1.5.4 for the Archer AX53 (EU) V1.0. They are not identical. The build date indicates that the second one is a newer and more optimized release. 1.5.4 Build 20250926 is the earlier public release. File size is larger and usually includes the full package for the initial rollout. 1.5.4 Build 20251029 is the later build. Even though the changelog text is the same, it normally contains fixes and stability improvements added during the release cycle. The smaller file size is typical for updated builds that reuse unchanged components. When two firmware files have the same version number but different build dates, the general rule is to install the one with the later build date unless TP-Link explicitly marks it as beta. In this case both are marked as official. So the recommended option is 1.5.4 Build 20251029. If you are already on the earlier 1.5.4, you can safely update to the newer build