No matter the phone of this Bionic series, it is clearly stated that the phones support a total storage of up to 32 GB storage. Inserting a 64 GB card will simply not work because of the operating system and the hardware which has been designed to recognize SD cards up to 32 GB. Also, a 64 GB SDXC card is from a high performance class of storage cards (Class 10 to be more precisely) and such it’s a very big possibility that the phone does not support this type of feature. There is no news about the release of newer drivers which could modify the limitation of your hardware.