(1) I downloaded the KW45-SDK and imported it into the IDE for compilation and programming. I didn't separately program the ELE firmware, but the RNG/AES, etc., so the ELE already seems to be flashed with some sort of NXP default firmware
(2) Regarding the storage issue of user keys, does ELE have a non-volatile storage area specifically for storing keys? Or do I need to export the keys in blob format to an external flash for storage