OK so those are the SK Hynix based modules. First of all, make sure your SoC voltage is at least 1.1V (set it to 1.15V to be safe). Also set RAM boot voltage (not sure what this is called on your board but it should be similar) to 1.35V. Also manually set DRAM voltage to 1.35V. Set your RAM speed and primary timings. First try 2T, if that works, try 1T. Now find a setting called ProcODT and initially set it to 80Ohms, if that doesn't work try the lower setting (60Ohms I think is the next one). Then if that doesn't work try 53.3Ohms. Give that a try and see how you go.