ZTE Z850 failed data error i see its old firmware why cannot unlock by box

SigmaKey v.2.29.10
426871453 Sigma dongle 2.29, Initializing...OK
Pack 1: Activated
Pack 2: Activated
Pack 3: Not activated
--------- 2018-11-09 23:23:05 ---------
SigmaKey 2.29.10 ADB: Direct unlock
* daemon not running. starting it now *
* daemon started successfully *
^ ZTE Handset ADB Interface
Version: Linux version 3.10.49-g3d22cfa-00559-g71906a3 (zhangchun@scm3) (gcc version 4.8 (GCC) ) #1 SMP PREEMPT Wed Jul 1 10:43:25 CST 2015
Phone model: ZTE Z850
Android 5.1; Firmware: LMY47O; Date: 2015年 07月 01日 星期三 10:36:34 CST
Version: Z850V1.0.0B03
Baseband Firmware: M8936FAAAANUZM-1.22048.1.22480.1
Please ROOT the phone first!
--------- 2018-11-09 23:29:07 ---------
SigmaKey 2.29.10 ADB: Direct unlock
* daemon not running. starting it now *
* daemon started successfully *
^ ZTE Handset ADB Interface
Version: Linux version 3.10.49-g3d22cfa-00559-g71906a3 (zhangchun@scm3) (gcc version 4.8 (GCC) ) #1 SMP PREEMPT Wed Jul 1 10:43:25 CST 2015
Phone model: ZTE Z850
Android 5.1; Firmware: LMY47O; Date: 2015年 07月 01日 星期三 10:36:34 CST
Version: Z850V1.0.0B03
Baseband Firmware: M8936FAAAANUZM-1.22048.1.22480.1
Baseband Processor: Qualcomm Technologies, Inc MSM8916
Removing firmware protection...OK
Preparing...........Data error