To change firmware to english on chinese dash camera version with s/n CA31 or CABAA , need to put on formated microsd - 3 files AAA222CCC.txt, engmode, SN.txt
AAA222CCC.txt, engmode are empty files , SN.txt with 14 symbols of s/n with US instead of CN
After changing s/n , format micro sd and download english emergency aid firmware from here
https://www.yitechnology.com/support/firmware_dash/id/3
copy it to micro sd and power on the camera , it should change firmware to english
Note : In general that should work only on 165 degree cameras that coming with CN firmware ,starting from 1.03.023 CN and higher.
Currently do not try to change language on Black CN version