No, no hay forma para que agarre bandas 4G LTE
Te dejo un poco de información sobre las bandas en funcionan cada uno.
C6502: UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1700 (Band IV),
1900 (Band II), 2100 (Band I)
GSM GPRS/EDGE 850, 900, 1800, 1900
C6503: UMTS HSPA+ 850 (Band V), 900 (Band VIII), 2100 (Band I)
GSM GPRS/EDGE 850, 900, 1800, 1900
LTE Band I, Band III, Band V, Band VII, Band VIII and Band XX
C6506: UMTS HSPA+ 850 (Band V), 900 (Band VIII), 1700 (Band IV),
1900 (Band II), 2100 (Band I)
GSM GPRS/EDGE 850, 900, 1800, 1900
LTE Band I, Band II, Band IV, Band V and Band XVI