I just checked it and it works flawlessy from here (Montreal, Canada). Depending of your location in the world, you may not be able to reach it.
Some shared url with my brother from Singapore often don't work over here and vice-versa.
Here is another link that your might try about NV/PRAM & SMC reset.
Take note however those procedures aren't of any use in the new M1 Macs...
Thank you so much for checking this link and I also recheck it and update you about this link. I hope it will work