Ubiquiti does not host old firmware indefinitely, but archived versions are available via the Ubiquiti Firmware Archive (requires an account) or through trusted mirror sites that checksum files against official SHA256 hashes.
| Source | URL | Notes | |--------|-----|-------| | Ubiquiti Community (requires login) | community.ui.com/releases | Search "AirOS v1.255" | | Ubiquiti Archive (legacy) | dl.ubnt.com/firmwares | Direct link structure: dl.ubnt.com/firmwares/XM/v1.255/ | | OpenWRT mirrors (for recovery) | downloads.openwrt.org/releases/ | Contains UBNT factory images | --- Upgrade Firmware Version 1-255 Ubnt Download
This specific firmware (ending in .11253 ) was released to address stability issues in legacy and early Wave 1 AC devices. Ubiquiti does not host old firmware indefinitely, but
Improved high memory usage reporting and added unstable process detection. This guide explains how to find the correct
This guide explains how to find the correct firmware for your device and the safest methods to perform an upgrade. 1. Locating the Official Firmware Download