The iCobra USB key is not being recognized by the iPhone or iPad, and writing on the iCobra key is impossible.

iCOBRA

The iCobra USB key is not being recognized by the iPhone or iPad, and writing on the iCobra key is impossible.

This problem is generated by the iOS 9.3.1 version. You have to update your iPhone or iPad with 9.3.2 version.
Please also check that iCobra is in FAT32 format.