hello, I bought it from aliexpress camera HDBW4421R-AS was ok when it arrived but I had forgotten and I used the key for all 'internal reset the camera, since that time has become in Chinese, but the working language is Chinese . I have already asked the company to me l 'has sold but should return to them in China and does not suit me. as far as I know there is an English firmware for the camera, there is only Chinese. those sold on aliexpress Chinese firmware translated into English, I would understand the procedure they use them to translate the firmware in English