Hey, so I am getting the same issue of "SMT config not found" error everytime I click start while the device is showing as 'connected'. Can you specify what you did that helped you solve this issue. I have spent a few hours re-downloading and using different PC's, and still cant figure it out.
Update: attached is a screenshot of what I am getting... Sadly, I just realized that I already had Persist.img from previously using 'Read Back' function, but I realized this as I saw it get overwritten when I decided to use Read Back function again today... :crying:
If anyone has an idea of what can help with this SMT issue, please let me know.
Update 2: I guess I should also ask, does anyone know if I need to lock my bootloader in order for this tool to work?
It should work regardless if the bootloader is unlocked or not. The problem is I think some parts of the program are set to expire after a certain date. I don't have the phone anymore, but what I did was close the program. Then disconnect your computer from the internet physically, so turn off WiFi, or remove ethernet cable. Assuming you're on Windows, right click the clock on the bottom right, and click "Change Date/Time". Turn off setting time automatically, and then change the date to something in December 2018 (at least I think that's what I used)... After that, it should open up and run normally, but if not try restarting (keeping internet disconnected), or try a different date either further back or closer to today's date.
Once the phone's restored, you can reset auto date/time, reconnect to internet, and then have windows update the time in the same menu so that the computer's back to normal.
This worked for me on one of the older versions, and I haven't had the phone for some time now, so I'm not sure if this will still work, but this is what fixed it for me.