Chosen Solution

Its is possible to change de IPad mini GSM 16 Gb Flash memory by 64 GB?

As you seem to know, iPads memory is flash memory. Removing it would be like trying to remove black parts on a RAM bar. This would be destructive for your device. Hope I helped you !

Review the iPad mini teardown as you can see the flash storage is soldered down look at Step 21. Between getting the correct flash chip, the needed skills to do this, and the amount of work it would require it really doesn’t make sense given the price of buying a new unit.

possible but very destructive. It is very difficult to reassemble any ipads back to factory quality

CAN i REPLACE THE FLASH MEMORY IN A IPAD MINI WITH A NEW BLANK ONE? I mean does it have to be loaded with any kind of firmware for the ipad to function normally?

No, not at all, you would have to get your hands on some iOS. Which you can’t, at least me and you cannot. Update (10/01/2019) But there is a video on YouTube that can help you