Failed to write imei mtk 6582

Baseband is ok………………mtk6582 android ver 5.0

>>
>>Operation:
1. Power off the phone.
2. Please insert USB cable within 20 seconds.
>>
>>Connecting…
>>CPU TYPE:MT6582
>>Hardware version:CB00
>>Software version:0001
>>SecCfgVal :0x00000000
>>BromVersion :0xFF
>>BLVersion :0x01
>>Boot downloading complete!
>>EMMC_ID:0x1501004B3758564D420193CAD42C9179
>>EMMC_PRODUCT_NAME: 0x4B3758564D42
>>EMMC_BOOT1_SIZE: 0x00400000
>>EMMC_BOOT2_SIZE: 0x00400000
>>EMMC_PRMB_SIZE: 0x00080000
>>EMMC_GP1_SIZE: 0x00000000
>>EMMC_GP2_SIZE: 0x00000000
>>EMMC_GP3_SIZE: 0x00000000
>>EMMC_GP4_SIZE: 0x00000000
>>EMMC_USER_SIZE: 0x1D2000000(7.28 G)
>>
>>Find partition success.
>>Write IMEI failed! ErrorCode:6

>>
>>COM port searching and preloader handshake.
>>Connect port COM42.
>>
>>COM port searching and preloader handshake.
>>Connect successfully.
>>Write IMEI failed!