[Xperia Z2 Q&A, Help & Troubleshooting] RickyHayward1:
So, when the instruction popup comes up saying to hold volume down and insert USB, once that's gone because it's connected I have to keep holding volume down until flash is complete? Flash takes like a minute, and so it's very hard to keep my thumb pressed down for that long. I tried it but I still got the same error thing anyway. That's problem not what you meant though.

This is everything that shows up:

13/001/2014 17:01:03 - INFO - Selected Bundle for Sony Xperia Z2 (D6502). FW release : 17.1.2.A.0.314. Customization : Customized_VN

13/001/2014 17:01:03 - INFO - Preparing files for flashing

13/001/2014 17:01:59 - INFO - Please connect your device into flashmode.

13/002/2014 17:02:12 - INFO - Device connected in flash mode

13/002/2014 17:02:12 - INFO - Opening device for R/W

13/002/2014 17:02:12 - INFO - Reading device information

13/002/2014 17:02:12 - INFO - Phone ready for flashmode operations.

13/002/2014 17:02:12 - INFO - Current device : Unknown: Apr 30 2014/12:16:06 - BH90KJV316 - Unknown: Apr 30 2014/12:16:06 - Unknown: Apr 30 2014/12:16:06 - Unknown: Apr 30 2014/12:16:06

13/002/2014 17:02:12 - INFO - Start Flashing

13/002/2014 17:02:12 - INFO - Processing loader.sin

13/002/2014 17:02:12 - INFO - Checking header

13/002/2014 17:02:12 - INFO - Flashing data

13/002/2014 17:02:12 - INFO - Processing of loader.sin finished.

13/002/2014 17:02:13 - INFO - Loader : S1_Root_9c84 - Version : MSM8974AB_22 / Boot version : S1_Boot_MSM8974AB_LA2.0.1_43-A / Bootloader status : ROOTED

13/002/2014 17:02:13 - INFO - Processing partition-image.sin

13/002/2014 17:02:13 - INFO - Checking header

13/002/2014 17:02:13 - INFO - Flashing data

13/002/2014 17:02:13 - INFO - Processing of partition-image.sin finished.

13/002/2014 17:02:13 - INFO - Parsing boot delivery

13/002/2014 17:02:13 - INFO - Phone boot version : S1_Boot_MSM8974AB_LA2.0.1_43-A. Boot delivery version : S1_Boot_MSM8974AB_LA2.0.1_43-A

13/002/2014 17:02:13 - INFO - Boot delivery up to date. Nothing to do

13/002/2014 17:02:13 - INFO - Processing kernel.sin

13/002/2014 17:02:13 - INFO - Checking header

13/002/2014 17:02:13 - INFO - Flashing data

13/002/2014 17:02:15 - INFO - Processing of kernel.sin finished.

13/002/2014 17:02:15 - INFO - Processing fotakernel.sin

13/002/2014 17:02:15 - INFO - Checking header

13/002/2014 17:02:15 - INFO - Flashing data

13/002/2014 17:02:16 - INFO - Processing of fotakernel.sin finished.

13/002/2014 17:02:16 - INFO - Processing apps_log.sin

13/002/2014 17:02:16 - INFO - Checking header

13/002/2014 17:02:16 - INFO - Flashing data

13/002/2014 17:02:17 - INFO - Processing of apps_log.sin finished.

13/002/2014 17:02:17 - INFO - Processing cache.sin

13/002/2014 17:02:17 - INFO - Checking header

13/002/2014 17:02:17 - INFO - Flashing data

13/002/2014 17:02:18 - INFO - Processing of cache.sin finished.

13/002/2014 17:02:18 - INFO - Processing system.sin

13/002/2014 17:02:18 - INFO - Checking header

13/002/2014 17:02:18 - INFO - Flashing data

13/003/2014 17:03:57 - ERROR - Processing of system.sin finished with errors.

13/003/2014 17:03:57 - INFO - Ending flash session

13/003/2014 17:03:57 - ERROR - ERR_SEVERITY="MINOR";ERR_CODE="0017";ERR_DYNAMIC="8009001C";