Ixpan mini 64GB not detected after update ixpand drive 4.8.1

hello sandisk, i have ixpand mini 64GB and iphone 6S with ios 10.3.1. i cant connect my ixpand after update app 4.8.1. before update my ixpand like a charm. how to downgrade version of ixpand drive app?

you cant down grade the FW or app. 

10.3 is pretty old. I would suggest updating your iOS. 

already updated into 11.4 but still same. just sometime it can detected