you should do the last part because people have been somehow unable to restore download mode.
You will know that it is restored when download mode looks different next time you boot into it.
After restoring the laf partition, you should be able to run:
Code:
fastboot continue
and it should boot into download mode.
If it shows an error, reboot into fastboot again, run:
Code:
fastboot erase laf
fastboot flash laf laf.img
fastboot continue
if it still doesn't work post here please.
now u can unbrick with LG Flash Tool or look at the twogbsd's simple unbrick guide.