So after spending hours messing around with this, I am now to the point that Cudgel is (or was). I have a blackvue that records video but a completely unfunctioning touch screen with audio and startup prompts in Russian...
Here's how the problem started:
Running 1.010 firmware on a Korean DR750LW-2CH that had been flashed to English from some crooked seller, I stupidly decide to upgrade to 1.012 before reviewing these forums (I had not had any problems updating to 1.008 and 1.010 in the past). My upgrade froze and after 20 minutes I pulled the plug. When restarting I got only black screen with all LEDs on. Only pulling the plug would turn it off. This exactly the same case as the guy above with youtube video ===
Here's what I tried:
1. Copying updated firmware 1.012 for both Korean and English version to the microSD, no response
2. I finally tried out the Russian forums, and paid the $10 (donation fee) to get access to their private restore software links. Here is a link to the thread, also written by Cudgel ===
http://car-dvr.info/forum/index.php?topic=938.0
Here is the thread where the software links are (you have to pay them to see the links):
http://car-dvr.info/forum/index.php?topic=30.0
3. After using the Russian recovery software, I was able to at least boot up, but when putting in a blank memory card, the screen would show an open door icon in the top left corner of the screen and then go black (but on) and all LED lights off. If I booted without a memory card, I would get the "drive responsibly" (I don't recall exactly what it says but it has a symbol of a hand and an X across it) and "please insert microSD card" screen in Russian also with Russian voice over.
4. Next I tried all variants of swapping out System and Config folders from various firmware versions (1.012 in ENG, KOR, RUS), with nothing getting past the same result as number 3
5. I realized I had made a copy of my microSD clear back when I was running 1.008. I copied this directly over to my microSD card. This time it booted up, with the "drive responsibly" in russian, and then it goes to a black screen, but the red record light flashes. When looking at the memory card later, it shows that the camera was recording, but none of the screen functions work.
So now I have a half-bricked $500 dash cam, that I have no idea how to fix it. Hopefully my dead ends are helpful to others so you don't waste time like I have done. What I really wish existed was a restore image with the English firmware. I will update the post if I figure anything else out. I would appreciate others if they have gotten farther than me to chime in and share their process.