ALOS Palsar InSAR between FBS and FBD mode

hello, i’am a newby. I am still new in terms of making interferometry. can you explain the steps how to create interferometry of two fbs and fbd modes. I have done the HH polarization selection and have my oversampling. but still not succeed. sorry if my English is bad

interferometr is (in the first place) not related to polarization. I would advise to only use one polarization for the generation of the interferogram and the upcoming steps.

You should not try to cross two different modes (FBS&FBD). Interferometry should work FBS-FBS and FBD-FBD.