For me, I think I found the firmware in:
C:\ProgramData\Sony Mobile\Update Engine\localstorage\US
There was a large 2gb file in there created when I ran the firmware restore for an Xperia.
I pointed the Flashtool at the directory, and it was ...
The emailed me with new codes, so you don't lose your codes. Let me know if your's goes through. I'll try again if it does.
It went through. After much fingercrossing :)
Sorry I'm not following this. I made a twrp backup using 184.108.40.206 and I got a bunch of .WIM files.
7-Zip recognizes those and opens them to have a .ext4 file. However every ext browser and mounter (in windows) I've tried can't seem to browse them....