Originally Posted by juiceme

bummer, not so easy

It seems that downloading the image is not possible from inside the Flashtool in the linux version, it requires an external windows binary "XperiFirm.exe"...

I tried flashing using the image found in @ExplIT's link (which seems to be "F5121_34.0.A.2.292_Customized DE" but either the image is noncomplete or there is something dizzy about my environment/setup, as Flasher fails for "no loader" and "no flash script" ...

Code:

root@tither:~/.flashTool# cat flashtool_2017-09-19_05-49-28.log 
19/031/2017 17:31:23 - INFO  - <- This level is successfully initialized
19/031/2017 17:31:28 - INFO  - Flashtool Version 0.9.23.1 built on 11-01-2017 15:12:00
19/031/2017 17:31:28 - INFO  - libusb version 1.0.20
19/031/2017 17:31:28 - INFO  - Executing search strategies to find proxy selector
19/031/2017 17:31:28 - INFO  - No proxy found for gnome. Trying next one
19/031/2017 17:31:28 - INFO  - No proxy found for kde. Trying next one
19/031/2017 17:31:28 - INFO  - Proxy found for firefox
19/031/2017 17:31:29 - INFO  - Syncing devices from github
19/031/2017 17:31:29 - INFO  - Opening devices repository.
19/031/2017 17:31:30 - INFO  - Scanning devices folder for changes.
19/031/2017 17:31:41 - INFO  - Pulling changes from github.
19/031/2017 17:31:42 - INFO  - Quietly closing devices repository.
19/031/2017 17:31:42 - INFO  - Devices sync finished.
19/031/2017 17:31:42 - INFO  - Loading devices database
19/031/2017 17:31:42 - INFO  - Loaded 98 devices
19/031/2017 17:31:42 - INFO  - Starting phone detection
19/031/2017 17:31:45 - INFO  - Device disconnected
19/032/2017 17:32:07 - INFO  - Device connected in flash mode
19/032/2017 17:32:43 - INFO  - Selected Bundle for Sony Xperia X(F5121). FW release : 34.0.A.2.292. Customization : Customized DE
19/032/2017 17:32:43 - INFO  - Preparing files for flashing
19/035/2017 17:35:10 - INFO  - Please connect your device into flashmode.
19/035/2017 17:35:12 - INFO  - Opening device for R/W
19/035/2017 17:35:12 - INFO  - Device ready for R/W.
19/035/2017 17:35:12 - INFO  - Reading device information
19/035/2017 17:35:12 - INFO  - Phone ready for flashmode operations.
19/035/2017 17:35:12 - INFO  - Opening TA partition 2
19/035/2017 17:35:12 - INFO  - Current device : F5121 - CB512EV81U - 1302-4766_R2D - 1300-4911_34.3.A.0.194 - GENERIC_34.3.A.0.194
19/035/2017 17:35:12 - INFO  - Closing TA partition
19/035/2017 17:35:12 - INFO  - Start Flashing
19/035/2017 17:35:12 - INFO  - No loader in the bundle. Searching for one
19/035/2017 17:35:12 - INFO  - No matching loader found
19/035/2017 17:35:12 - WARN  - No loader found or set manually. Skipping loader
19/035/2017 17:35:12 - INFO  - Loader : S1_Root_d553 - Version : 1299-4841_S1_Boot_MSM8956_LA1.0.1_N_160 / Boot version : 1299-4841_S1_Boot_MSM8956_LA1.0.1_N_160 / Bootloader status : ROOTABLE
19/035/2017 17:35:12 - INFO  - Max packet size set to 4M
19/035/2017 17:35:12 - INFO  - USB buffer size set to 512K
19/035/2017 17:35:15 - INFO  - Parsing boot delivery
19/035/2017 17:35:15 - INFO  - No flash script found.
19/035/2017 17:35:15 - INFO  - Flash script is mandatory. Closing session
19/035/2017 17:35:15 - INFO  - Ending flash session
19/035/2017 17:35:15 - INFO  - Flashing finished.
19/035/2017 17:35:15 - INFO  - Please unplug and start your phone
19/035/2017 17:35:15 - INFO  - For flashtool, Unknown Sources and Debugging must be checked in phone settings
19/035/2017 17:35:16 - INFO  - Device connected in flash mode
19/036/2017 17:36:35 - INFO  - Device disconnected
root@tither:~/.flashTool#