n910u write cert fail with new version

Hi plz fix this problem trying to write cert file on Samsung n910u giving this error

Code:

Chimera Mobile Phone Utility version: 8.60.1726 @ 2015-12-21

[Read/Write certificate started]

Gathering phone info...
Collecting information. Be patient! Do NOT disconnect the phone!
Model: SM-N910U
Sales Code: TNZ
Country Code: New Zealand
Android Version: 5.1.1 [LMY47X]
Build Date: Sat Oct 17 12:17:20 KST 2015
PDA Version: N910UXXU2COJ2 [october 2015, rev2]
Phone Version: N910UXXU1COJ2 [october 2015, rev2]
CSC Version: N910UTNZ2COJ2 [october 2015, rev2]
Product Code: SM-N910UZWETNZ
HIDSw Version: N910UXXU2COJ2/N910UTNZ2COJ2/N910UXXU1COJ2/N910UXXU2COJ2
Board Platform: EXYNOS5
Modem Platform: XMM7260
Serial Number: RF8FB0XVSJD
Imei: 355844060215086
Unique Number: CR2008FCDF2DB81
Connections: AT,MTP
Battery Status: 3.83V (20%)
SIM Status: NOT_READY
Knox Version: 0
Warranty Bit: 1

Determining secure image format.
done.

Creating backup.
done.

Gathering cert informations
done.

Calculating key.
Chtool app run failed!
Finished at local time: [12.21.15 14:08:09]
WorkID: 8410522