--- Upgrade Firmware Version 1-255 Ubnt Download 'link' May 2026

Because version 1.255 is often used for recovery, you cannot always upload it via the standard web interface. Instead, you must use .

First, flash an intermediate version (e.g., v5.6.2), then v6.3.2, then v8.7.1. Skipping directly may brick the device. --- Upgrade Firmware Version 1-255 Ubnt Download

https://dl.ubnt.com/firmwares/airmax-m/XM/v1.2.55/XM.v1.2.55.bin Because version 1

If you cannot harden it, isolate the device on a dedicated VLAN with no WAN access. you must use . First