Google banned me from my phone - Android Q&A, Help & Troubleshooting

On a H815 (LG G4). I did a factory reset, and ended up with the "This device was reset to continue, sign in with a Google account previously synced on this device." message. When trying to sign in, it loops back to my login and tells me to use an account previously used on this device.
Google recognises this account as the previous owner as this phone as proven by the Android Device Manager.
On the internet it was written that this Device Protection thing could be postponed if both my password and phone changes within 72 hours, since it could mean that someone stole my phone. 72 hours have passed, and not just that, my password hasn't changed since July (a month ago).
I have contacted LG. They have explained that this is a Google server problem, there's nothing they can do since it's all Android. The best I could find was call a local employee who knows Google Play a bit but had no authority to do anything. Ideally I'd like to talk to someone with Google who can fix this for me. Unfortunately Google does everything it it's power not to have to talk to customers. Is there someone who knows how I can reach someone knowledgeable about this? Maybe someone knows how to fix this problem with selfhelp? I already tried flashing a new stock rom. Don't know how to flash CyanogenMod without USB Debugging or TWRP.
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MaybeRichard said:
On a H815 (LG G4). I did a factory reset, and ended up with the "This device was reset to continue, sign in with a Google account previously synced on this device." message. When trying to sign in, it loops back to my login and tells me to use an account previously used on this device.
Google recognises this account as the previous owner as this phone as proven by the Android Device Manager.
On the internet it was written that this Device Protection thing could be postponed if both my password and phone changes within 72 hours, since it could mean that someone stole my phone. 72 hours have passed, and not just that, my password hasn't changed since July (a month ago).
I have contacted LG. They have explained that this is a Google server problem, there's nothing they can do since it's all Android. The best I could find was call a local employee who knows Google Play a bit but had no authority to do anything. Ideally I'd like to talk to someone with Google who can fix this for me. Unfortunately Google does everything it it's power not to have to talk to customers. Is there someone who knows how I can reach someone knowledgeable about this? Maybe someone knows how to fix this problem with selfhelp? I already tried flashing a new stock rom. Don't know how to flash CyanogenMod without USB Debugging or TWRP.
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http://forum.xda-developers.com/g4/general/bypass-google-account-lg-g4-tool-t3261627

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@kuya38 Wonderful, took some tweaking but it worked. Very happy, you saved me quite a few hundred euro.