What about flooded batteries, I set as below: 1- SbU,2-20A,3-UPS,5-Fld,12-46,13-57,16-OSO,26-58.4,27--54,the reminder I leave it as default 

If battery type is set to FLD, then assuming an Axpert inverter, settings 26, 27, and 29 are all preset, and can't be changed. If you have exact figures for those, often printed on the side of the battery module, then you should use battery type USE. FLD is just a short cut for those three settings, suitable for most flooded batteries.