Just tested it right now — it's working. You should waiting till " 媒体库生成完成,请上传至服务器" message and than press generate QR code. My databases about 10 Mb big. Maybe your database is too big, try to reduce a quantity of files on SD card or test it with other SD card.
My brother have r2r2000 and new HM1000 with Himalaya chip — it's worse than Lotoo Gold and far away from r2r2000, there is no miracle! Burr Brown 1704 was a pinnacle of very precise and yet abaddoned technology (laser trimmng, etc.). Some modern advanced r2r designs can compete with it, but almost never in compact design. Hifiman is not a famous semiconductor company, their "new chip" looks more like Chord fgpa matrix with it's limitations.