Use should use TFTP method to revert to UBNT firmware.
1.First of all, power off the device
2.Setup your PC: Windows PC's Ethernet must be configured manually with the following settings (under Network Connections):
3.IP Address: 192.168.1.254, Subnet Mask : 255.255.255.0
4.Connect AirOS device to PC
5.Begin by depressing the reset button. Keep holding, then power the unit on. Wait 8 seconds then release the button (if you want to reset the unit to factory defaults, wait at least 15 seconds). Signal LEDs will be lit indicating that the device is ready for recovery
6.Make sure that AirOS device responds to pings (perform a ping 192.168.1.20 from a DOS window), if it does not, go back to the first step
7.Upload firmware image file .bin to 192.168.1.20, using a TFTP client software.
8.Wait for about 7-10 minutes (devices and firmware depending) - do not power off the device during the procedure!
IMPORTANT!
Do not switch off, do not reboot and do not disconnect the device from the power supply during the firmware upgrade process, as these actions will damage the device!
Firmware Link:http://www.mediafire.com/download/586bscxin537223/TP-LINK_to_UBNT_NS2.rar
TFTP link:http://www.mediafire.com/download/nconsv71zbxsblq/TFTP.rar
(Last edited by siddhantpatel001 on 3 Feb 2015, 17:57)