Install / Update MCUFRIEND_kbv via the Library Manager.
From the extras/mcufriend_how_to.text:
HX8347-I 240x320 ID=0x9595 #define SUPPORT_8347D
Edit MCUFRIEND_kbv.cpp:
from
//#define SUPPORT_8347D //HX8347-D, HX8347-G, HX8347-I +520 bytes, 0.27s
to
#define SUPPORT_8347D //HX8347-D, HX8347-G, HX8347-I +520 bytes, 0.27s
David.