ae cho lời khuyên ạ.... Tks all . FLASH INSTRUCTIONS: 1. Choose correct flash file(s). 2. If you have PIT file chosen, then you must check 'Repartition' option. 3. If you have one file firmware, then you must check 'Use one package file' option. 4. Check flashing options if needed (Repartition, EFS clear, Boot update). 5. Power on phone in download mode (turn off phone, hold Volume Down + Home + Power). 6. Connect phone to PC with USB cable, install drivers if needed. 7. Press 'Flash' button. Operation: Flash Selected model: GT-S7390 Software version: 20.5 File analysis... OK Total file size: 0x00189847 (1 Mb) Searching USB Flash Interface... detected COM8 Setup connection... OK Reading PIT from phone... OK Sending BcmBoot.img... error timeout Done with Samsung Tool v.20.5