: Users have reported that Java 8 Update 251 is the last version where the tool reliably works. Modern updates (like Java 8 Update 281 and higher) typically break the application.

Instead of fighting with your system-wide Java installation, use an older, portable version specifically for this tool: Download an older JRE: Look for a portable version of Java 8 Update 271 or earlier. Edit the .bat file: If your discovery tool came with a

If after all this, the UBNT Discovery Tool v2.5.1 still won’t cooperate with your updated Windows 10, consider these modern alternatives:

Ubiquiti released a discovery tool that requires NO Java. It runs flawlessly on Windows 10 but lacks the batch firmware upgrade feature of v2.5.1.