Here is the stock firmware for the PTV Wireless Miracast Dongle. It base in Realtek chip, and support miracast and DLNA.
Here is the stock firmware download link:
1 Download the file from above link,and decompress the file;
2 Copy the download file” install.img” to the empty U disk (make sure to put the file in root directory.
3 Use the OTG cable in the package and connect the U Disk with your PTV use the USB Port in PTV.
4 Use the paperclip to press the reset button, and at the same time, connect the PTV with power adapter.
5 After 10-15 seconds, connect the PTV with your TV via HDMI Cable, and then you will see the upgrade is processing.
6 After upgrade successfully, the PTV will restart and you will get a new firmware on PTV.
Shopping link for PTV is here: