--- Upgrade Firmware Version 1-255 Ubnt Download Guide

Go to web.archive.org and paste: http://dl.ubnt.com/firmwares/XM/v1.255/ You may find snapshots from 2014–2016 with downloadable bins.

Many users report that the official dl.ubnt.com link for v1.255 returns a 404 error. Ubiquiti purges old firmware regularly. Here are three workarounds:

When you search for "Upgrade Firmware Version 1-255 Ubnt Download" , Google will return dozens of third-party sites like firmware-file.net, driverscollect.com, or random GitHub repositories. Proceed with extreme caution.

| 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

Pro Tip: Use wget or curl to download from the command line to avoid browser-based redirects:

wget https://dl.ubnt.com/firmwares/XM/v1.255/XM.v1.255.140929.1650.bin

That’s likely an AirControl or batch upgrade script referencing a variable range – not a real firmware file. For example:

for v in 1..255; do upgrade 10.0.0.$v; done

(This is dangerous and outdated – do not run it.) Go to web

Ubiquiti has removed many legacy files from their official dl.ubnt.com repository. However, through official archives and community mirrors, you can still find the legitimate binaries. Always verify SHA256 checksums.

If you used 1.255 as a recovery tool, you now need to upgrade to a safe, modern version (v6.3.2 or v8.7.11 for airMAX M).

Warning: A direct jump from 1.2.55 to 8.x will fail. You must follow the sequential upgrade path: That’s likely an AirControl or batch upgrade script

Upload these via the Web UI: Navigate to System > Firmware Update > Choose File > Upload.

Ubiquiti released GPL source for AirOS v1.x. You can cross-compile using their toolchain, but this is only for developers.