Marta connected to the working AF-5X at Denison West. She disabled its transmit power to avoid interference, then fired up a packet sniffer. She could see the bricked East radio still beaconing a corrupted ARP request every 12 seconds—a death rattle.
Marta didn’t panic. She switched from UDP to TCP-tunneled TFTP through the West radio’s management plane, sacrificing speed for reliability. The upload resumed. Block 312. Checksum valid.
When a firmware update on a remote Ubiquiti AF-5X link fails, a lone engineer has one night to resurrect a critical 30-mile backhaul before a mining operation loses millions. The Setup
Then silence.
For 90 seconds, both radios went dark. The mine’s network dashboard showed nothing. Her phone buzzed with the first on-call manager asking for an update. She ignored it.
while true; do tftp -m binary 10.0.3.88 -c put AF5X-v3.7.11.bin -t 1 sleep 11.5 done On the tenth attempt, nothing. On the twenty-third, a single acknowledgment packet came back. The East radio had bitten. But the window was only 2.7 seconds. She watched the hex dump scroll—blocks 1 through 312 of the firmware uploading at 1 Mbps over the degraded control channel.
But the AF-5X’s recovery mode required physical reset on the bricked unit… unless you could exploit a known quirk in the v4.0.2-beta’s early boot sequence. She’d read a buried forum post two years ago from a ham radio operator in Finland. The trick: send a precisely timed TFTP request during the 3-second window when the radio power-cycles its RF chip.
She had one option: recover via the bootloader over the air.
