I would like to ask for the same ...
LG G2 32 GB from HK , today made update by LG PC Suite to software ver D80220B, after restart I stocked with PIN/ Password to decrypt inquiry ...
What to do ? I have followed your suggestions but it doesn't work ..
Frankly speaking I have only tried with D80220A ver , to downgrade the phone
But after switching to LG Mobile , it still downloading the newest version again - the effect after restart was the same , inquiry for PIN/ Password .
I have noticed that after switching language and location from Poland to Korean Republic - it showed in LG mobile support tool , two options ... one of them was to get your PIN - but unfortunately I need to register and www was in Korean ..
Any ideas , hints - I will appreciate your kind support