Please, do not switch off power supply during firmware upgrade. It is possible to upload new version of HT102 application from web browser on the device IP address (the browser PC must be in the same network). In section Administration ->Upload new firmware on device choose aforesaid folder. It is uploaded as is. Then must be device restart.
If there is problem with web connection to the device, please check that WEB DIP switch is at OFF position. If ON at power on the web a FTP access is disabled.