SSH / CLI:
Controller-based (UniFi):
TFTP recovery (for bricked or low-level upgrades): --- Upgrade Firmware Version 1-255 Ubnt Download
Ubiquiti does not host changelogs for builds older than 5.x. Community records indicate this version fixed a DHCP client race condition and added compatibility for the older AirView spectrum analyzer.
That’s likely an AirControl or batch upgrade script referencing a variable range – not a real firmware file. For example: SSH / CLI:
for v in 1..255; do upgrade 10.0.0.$v; done
(This is dangerous and outdated – do not run it.)
After download, compute the SHA256 checksum. On Windows (PowerShell): Controller-based (UniFi):
Get-FileHash XM.v1.255.140929.1650.bin -Algorithm SHA256
On Linux/macOS:
sha256sum XM.v1.255.140929.1650.bin
Compare the output with the official hash (usually posted on the firmware release thread in Ubiquiti’s forum). If mismatched, delete the file immediately.