My Optimus G Pro F240L was somehow soft bricked for a month after trying to install a version of CM11. I have tried to download many dfferent F240L .TOT files to get it back to life on Baidu, all files were corrupted, at least for me, and i had the low battery warning when trying to flash official .KDZ .
Then I have tried the tutorial on this thread with AT&T .TOT file for E980, thanks to madmack :
Don't use the DLL which is there, instead if you have F240L use the one on this thread, thanks to chimmot307:
The phone is back to life, but no signal and no SD-card
At this point, you need to root the phone and install CWM using the files in this thread thanks to XQ55 :
Then Install the F240 baseband or the one compatible with your phone by flashing it in cwm using the files in this thread thanks to anirudhks:
Ok now the signal an SD-card is back and you have a brand new E980 AT&T phone !!!
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You can now also flash official .KDZ for your F240 or keep this version as I did.