Unihiker K10 Original Firmware

Hi,
I loaded the firmware on my Unihiker K10 so that I can program it with Thonny.
I would like to reset my Unihiker to its original firmware. I am unable to load the required level of Mind+ on my Mac as dfrobot's webpage instructs.
Is there an alternative way of doing this? If so, where can I download the original firmware?
Thank you
You can also restore the original firmware (Arduino firmware) using the Arduino IDE.
1. Download and set up your Arduino IDE.
Tutorial:
https://www.unihiker.com/wiki/K10/GettingStarted/gettingstarted_arduinoide/
2. Press and hold the BOOT button on the back of the K10, then release the BOOT button after connecting it to your PC/Mac via USB.
3. Upload an empty program in the Arduino IDE. Like the following:
void setup() {
// put your setup code here, to run once:
}
void loop() {
// put your main code here, to run repeatedly:
}
4. Disconnect the USB cable and reconnect the K10 to your PC/Mac.
Your K10 has been restored to Arduino firmware.
We will add this restore

Thanks!