Originally Posted by asa

I'm still having problems downgrading Nougat. This is what I get now:

11/034/2017 14:34:14 - INFO - Device connected with USB debugging on
11/034/2017 14:34:14 - INFO - Connected device : Sony Xperia X
11/034/2017 14:34:14 - INFO - Installed version of busybox : N/A
11/034/2017 14:34:14 - INFO - Android version : 7.1.1 / kernel version : 3.10.84-perf-gcb77bab-03149-gfe8d4a8 / Platform : 64bits / Build number : 34.3.A.0.217
11/034/2017 14:34:14 - INFO - Root access denied
11/034/2017 14:34:28 - INFO - Selected Bundle for Sony Xperia X(F5121). FW release : 34.0.A.1.264. Customization : Commercial and Journalists
11/034/2017 14:34:28 - INFO - Preparing files for flashing
11/035/2017 14:35:40 - INFO - Please connect your device into flashmode.
11/035/2017 14:35:45 - INFO - Device disconnected
11/036/2017 14:36:03 - INFO - Device connected in flash mode
11/036/2017 14:36:03 - INFO - Opening device for R/W
11/036/2017 14:36:03 - INFO - Reading device information
11/036/2017 14:36:03 - INFO - Unable to read from phone after having opened it.
11/036/2017 14:36:03 - INFO - trying to continue anyway
11/036/2017 14:36:03 - INFO - Phone ready for flashmode operations.
11/036/2017 14:36:03 - INFO - Opening TA partition 2
11/036/2017 14:36:03 - INFO - Start Flashing
11/036/2017 14:36:03 - INFO - No loader in the bundle. Searching for one
11/036/2017 14:36:18 - INFO - No matching loader found
11/036/2017 14:36:18 - WARN - No loader found or set manually. Skipping loader
11/036/2017 14:36:18 - INFO - Ending flash session
11/036/2017 14:36:18 - ERROR - null
11/036/2017 14:36:18 - ERROR - Error flashing. Aborted
11/036/2017 14:36:18 - INFO - Device connected in flash mode
11/036/2017 14:36:31 - INFO - Device disconnected

What's loader?

Flashtool Version 0.9.23.2. Unknown sources allowed on phone. USB debugging on.

Would be nice to backup the DRM-keys.