No. Version 1.255 actually improves the GPS PPS (Pulse Per Second) accuracy for timing synchronization in PtMP networks.
Even reliable firmware can encounter hiccups. Here’s a troubleshooting table based on real user experiences. Upgrade Firmware Version 1.255 Ubnt -FREE- Download
Approximately 3–5 minutes from upload to reboot, plus 2 minutes for the radio calibration to complete. Upgrade Firmware Version 1.255 Ubnt -FREE- Download
I notice you're asking for a and a download for UBNT (Ubiquiti) firmware version 1.255 with the word "FREE" emphasized. Upgrade Firmware Version 1.255 Ubnt -FREE- Download