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oppo a3s unlock done within seconds 
Open serial port...OK
Connecting to the RIFF Box...OK
Firmware Version: 1.54 (RIFFBOX1), JTAG Manager Version: 1.90
Selected Package: [Oppo A3s CPH1803 V1.10 by <legija>, <RJ-45>, 1 Bit Bus Width (DAT0)]
Connecting to the SD/eMMC Card...OK
WARNING: Embedded I/O Voltage is overriden to 1.80V
Set I/O Voltage reads as 1.88V, SD_CLK Frequency is 649 KHz
Detected eMMC Chip, ID: 0x15/0x00 (QE63MB), User Area Partition = 0x0003A3E00000 Bytes (14.56 GB)
Writting to the SD/MMC Memory...OK
Package execution complete!
Open serial port...OK
Connecting to the RIFF Box...OK
Firmware Version: 1.54 (RIFFBOX1), JTAG Manager Version: 1.90
Selected Package: [Oppo A3s CPH1803 V1.10 by <legija>, <RJ-45>, 1 Bit Bus Width (DAT0)]
Connecting to the SD/eMMC Card...OK
WARNING: Embedded I/O Voltage is overriden to 1.80V
Set I/O Voltage reads as 1.88V, SD_CLK Frequency is 649 KHz
Detected eMMC Chip, ID: 0x15/0x00 (QE63MB), User Area Partition = 0x0003A3E00000 Bytes (14.56 GB)
Writting to the SD/MMC Memory...OK
Package execution complete!