problem with writing IMEI G750-u10 BST

Hi !
I have a G750-U10 and the IMEI is null
here the log before rapairing IMEI with BST
Hardware: mt6592
Bootmode: 0
Bootloader ver: unknown
Revision: 0
Main version:
Baseband ver: unknown
GSM baseband: MOLY.WR8.W1315.MD.WG.MP.V19.P13, 2014/07/18 15:21
GSM sim state: ABSENT
Get Bluetooth info failed
WiFi interface:
WiFi MAC: 00:08:22:bc:c0:fb
WiFi state: COMPLETED
Network [1]: GSM IMEI: null
Network [2]: GSM IMEI: null
Root Access: ROOTED

Get device information done , time used 4.80s
Time used : 4.8 s
I have rooted it and I'v enable USB debugging , I wrote IMEI but it is still null
please help me.
IMEI repair Log
Turn on device and connect with USB cable ...
Prepare environment ...
Writing IMEI1 ... ok, You need reboot device
Writing IMEI2 ... ok, You need reboot device
info after that
Hardware: mt6592
Bootmode: 0
Bootloader ver: unknown
Revision: 0
Main version:
Baseband ver: unknown
GSM baseband: MOLY.WR8.W1315.MD.WG.MP.V19.P13, 2014/07/18 15:21
GSM sim state: ABSENT
Get Bluetooth info failed
WiFi interface:
WiFi MAC: 00:08:22:b2:bb:fb
WiFi state: COMPLETED
Network [1]: GSM IMEI: null
Network [2]: GSM IMEI: null
Root Access: ROOTED

Get device information done , time used 4.78s
Time used : 4.8 s

What can I do???

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