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RUU_HIMA_UL_L51_SENSE70_ATT_MR_NA_Gen_Unlock_2.8.617.4_Radio_01.01_U11440601_76.03.50611G_F_release_439079_signed_2
-rename rom.zip to 0PJAIMG.zip
-copy 0PJAIMG.zip to ext_sd card
-boot into download mode
-it will scan your ext_sd card, then ask if you want to start the update
-press volume up & let it do it's thing...