here log
>>Current Task:
USB Wirte IMEI
>>
>>Operation:
1. Power off the phone.
2. Please insert USB cable within 40 seconds.
>>
>>MediaTek PreLoader USB VCOM (Android) (COM17)
>>
>>Connecting...
>>CPU TYPE:MT6580
>>Hardware version:CA00
>>Software version:0000
>>SecCfgVal :0x00000000
>>BromVersion :0xFF
>>BLVersion :0x01
>>Boot downloading complete!
>>EMMC_ID:0x8801034E43617264202688701118439B
>>EMMC_PRODUCT_NAME: 0x4E4361726420
>>EMMC_BOOT1_SIZE: 0x00400000
>>EMMC_BOOT2_SIZE: 0x00400000
>>EMMC_PRMB_SIZE: 0x00400000
>>EMMC_GP1_SIZE: 0x00000000
>>EMMC_GP2_SIZE: 0x00000000
>>EMMC_GP3_SIZE: 0x00000000
>>EMMC_GP4_SIZE: 0x00000000
>>EMMC_USER_SIZE: 0x1CE100000(7.22 G)
>>
>>INT RAM: 128KB SDRAM EXT RAM: 1GB DRAM
>>Find partition success.
>>Write data success.
>>Update IMEI success.