X21(PD1728F_EX_A_6.10.11)-Android 9-IN can not use
X21(PD1728F)-(PD1728F_EX_A_6.9.4)-Android 9-IN
X21(PD1728F)-(PD1728F_EX_A_6.70.8)-Android 9-IN
X21(PD1728_A_7.10.16)-fastboot-9008-Android 9
X21(PD1728_A_6.17.12)-fastboot-9008-Android 9
X21(PD1728F_EX_A_1.13.2)-TH,IN,MY,PH,HK,TW,RU,SG