Well, I'll link him to this thread and see what he does with it...Good work, BTW.... This device really needed this.
Appreciate the inclusion here, but I don't know of any way to dd from fastboot. You need to be in adb w/su to use it. I've also been looking for the proper .kdz file for this device, and if it exists "at all" someone want $$ for it. Cripe, the WHOLE PHONE only cost me $20 (shipped no less)! Scumbags if you ask me...
Being you're truly soft bricked,
the phone is fubar w/o the .kdz.
Assuming you can get into DL mode, what do you have to lose by flashing say the L70 or VS450PP firmware? The L70 is a Sprint device and *might* work "out of the box" once flashed with the
LGFlash tool directly. A possible alternative would be to try the
VS450PP firmware, though it has a VZW radio. If you can get the phone to boot into either fw, you could then towelroot it, and dd to your hearts content. I have (and have provided bcrichster with) the /boot and /system .img's from the LS620
if you can get that far. Just ask and one of us can provide them.
Easier yet (should you succeed in getting it to boot into
either FW),
install TWRP and restore a Realm nandroid backup from someone else who has one containing the
real LS620 TWRP backup image(s). As long as it doesn't touch the /EFS, the phone may well be revived/usable.
Just my thoughts...