I cannot change the firmware into English, here is my step:-
Could you help to see anything wrong in my steps?
1. Downloaded the "DR750LW-2CH_v1.010_ENG_(2014.11.28)_Windows" from the Blackvue official website.
2. Downloaded the "DR750_1.007_Kor-Eng" from your link
3. Unzip the "DR750LW-2CH_v1.010_ENG_(2014.11.28)_Windows" and place it in the SD card. The folder name is Blackvue.
4. Unzip the "DR750_1.007_Kor-Eng" and we got 1 folder named upgrade(2zip files and 2 sue files) and 7files.
5. All files in step 4 are copied and replaced in the "SYSTEM" inside the Blackvue(In step 3)
6. Insert this SD card into the camera.
7. Turn on the camera.
Finally, it still Korea version