Hi Tamizharasan,
forget about accessing / factory defaulting the AP.
Based on above sequence this is unable to load image properly and if you are locked withing this loop you won't be able to access WiNG OS (allowing you to factory default the AP) nor diag> mode (bootloader).
If situation is like this I strongly advise you to RMA this device and get replacement.
Was this AP ever working fine or is this DOA?
Please contact either your distributor / business partner or raise RMA directly.
Regards,
Ondrej