C6906 4.2.2 to 4.3 flashtool error topic

I have 2 Sony z1s. Both came with 4.2.2 stock firmware. One phone I inserted sim and did the OTA update and got it to 4.3. I then used flashtool to flash it to unbranded 4.3. The second Z1 I didnt do the OTA and tried to use flash tool to go straight to unbranded 4.3 and I keep getting this error message below. Any help would be appreciated.


25/023/2014 20:23:32 - INFO - Flashtool Version 0.9.13.0 built on 2013-06-04 22:50:00
25/023/2014 20:23:37 - INFO - Device connected in flash mode
25/023/2014 20:23:42 - INFO - Selected C6906 / 14.2.A.0.290 / Generic CA
25/023/2014 20:23:43 - INFO - Preparing files for flashing
25/023/2014 20:23:53 - INFO - Please connect your device into flashmode.
25/023/2014 20:23:54 - INFO - Opening device for R/W
25/023/2014 20:23:54 - INFO - Reading device information
25/023/2014 20:23:54 - INFO - Phone ready for flashmode operations.
25/023/2014 20:23:54 - INFO - Current device : C6906 - CB5124TWX6 - 1276-9387_R5A - 1272-6084_14.1.G.1.406 - AMERICAS-LTE_14.1.G.1.406
25/023/2014 20:23:54 - INFO - Start Flashing
25/023/2014 20:23:54 - INFO - Processing loader.sin
25/023/2014 20:23:54 - INFO - Checking header
25/023/2014 20:23:54 - INFO - Flashing data
25/023/2014 20:23:54 - INFO - Loader : S1_Root_6732 - Version : MSM8974_23 / Boot version : S1_Boot_MSM8974_LA1.0_50 / Bootloader status : ROOTABLE
25/023/2014 20:23:55 - INFO - Processing partition-image.sin
25/023/2014 20:23:55 - INFO - Checking header
25/023/2014 20:23:55 - INFO - Flashing data
25/023/2014 20:23:55 - INFO - Parsing boot delivery
25/023/2014 20:23:55 - INFO - Phone boot version : S1_Boot_MSM8974_LA1.0_50. Boot delivery version : S1_Boot_MSM8974_LA1.04_15
25/023/2014 20:23:55 - INFO - Going to flash boot delivery
25/023/2014 20:23:55 - INFO - Ending flash session
25/023/2014 20:23:55 - ERROR - -1
25/023/2014 20:23:55 - ERROR - Error flashing. Aborted