[G2 Q&A, Help & Troubleshooting] GTMoraes:
Fix found!

Here's the previous error:

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Hi.

I've tried this night to flash the 4.4.2 "official" update. Installation was a breeze and I rooted shortly after the install, as I would lose Recovery.

Phone booted up, but I had no network signal. I've set the phone up and noticed the IMEI was listed as "null". Bad news.

I had a EFS backup, it was on the phone, but I had no recovery anymore.

I heard I had to go back to stock using LG Flashtool and some KDZ files. I've managed to get my version' KDZ and the proper Flashtool, but every time I reach 47% (49% on the phone's screen), it would say this:

(In red: my edits. In bold, my comments)

The Download mode says "ROOTED" in red, even though my firmware is stock, without any superuser app, so I can't use the warranty here.

It seems that it detects it "ain't" a D805 (as it has a D802 firmware flashed) and halts the installation.

I've tried almost everything on the book (disabling LG Modem, changing COM port to 41), but I didn't try changing computers. Will do tomorrow.

After several tries (since 8PM), I've tried to download and install the D802 stock ROM.

It worked! It flashed successfully and booted right away... or so. It needed a hard reset, as it was bootlooping (probably something from the 4.4 KitKat ROM)....

........................Do you see the sh*t I did there? The EFS backup is lost. I hope the EFS itself ain't lost, but the modem version is wrong or something. The IMEI can still be detected by the LG Flashtool.

So, on to booting. It booted alright, but without network signal as I expected (D802 modem). Funny thing is that the modem differences between the D802 and D805 is just the 700MHz(D805) and 800MHz (D802) 4G LTE and some other high frequency 4G LTE. The HSDPA 3G/GSM freqs are the same, but it ain't getting signal.

But, after a while, I started getting choppy transition effects and a toast with the text "Error" that couldn't be skipped (by clicking). And it would hotboot shortly after. And keeps doing this until I shut it down (sometimes it wakes itself up, even). I've managed to enable developer mode and check the ADB Debugging so I could root and install a recovery (I have a full NAND backup from my original D805 firmware, and the proper modem right here for flashing), but ADB cannot find the device for some reason. The RSA fingerprint doesn't pop up on the screen, and it keeps hotbooting anyway, I think it would be extremely risky.

I can trigger the hotboot faster if I head to About Device and go to Network Status or Software Status (or something in that lines), then the "Error" toast shows up and it hotreboots. I think it tries to read something, but it can't, so it reboots.

I even enabled Airplane mode, but it didn't help at all.

I can trigger the hotboot EVEN faster if I turn the screen off and try to wake it up. The LED would light up and keep on, then the LG logo would show up.

I've downloaded the D80510A and D80510B, but they both don't work! Gives the same error output.

I have other two LG G2 D805 here from my family, and I can gather any data from them, if necessary.

I'd love to contribute to the person who finds a fix for this, but I'm in the lean cows time. I can't afford to buy a phone in the next 6 months (or to lose this one), but rest assured that when the sun shines upon me, I'll pay you a great beer =)