No, not a chance your data can be saved, sad to say. I spent about a month running from one repair shop to another, leaving my G4 at one shop for 2 weeks, pleading them to find whatever way to salvage my data n that i am willing to pay, no problem. All shops told me they tried all ways but there is simply no way. 2 advised me to take it back to LG to repair since i still got warranty instead of spending 100++ and unable to get back my data.
I gave up finally and brought to LG. They just took 1 day n i got the message the next day evening saying my hp ready for collection. Am I supposed to feel happy that it's so fast? N yeah, i got back my G4, looks just like the day i bought it... Inside clean as can be.
So we are just unlucky? I am using my spare phone, G pro 2 now, also had rebooting problems before, luckily had a close shave tho n saved my data before it died. Not so lucky with my G4. Well, as for me, this is the final straw..
The only thing is that the battery life is horrible. 100% this morning and now dropped to 22%..
even the battery... g3 seem to be last longer... g4 sometimes even become hotter than g3...and now my n6p running on sd810 is cooler.. 
