Story: I had problems restoring my macbook to OS High Sierra. So many failed attempts. So many gb of our internet wasted. I even topped up because we already reached our limit from keeping on downloading 5gb of corrupt OS from apple's website and from 3rd party websites. I googled and found out that I wasn't the only one having this problem. Macbooks with OS Sierra or High Sierra had problems restoring due to corrupt file from Apple Server (FOR SOME REASON, I DON'T KNOW WHY APPLE IS GIVING US THIS PROBLEM). So I called iStore and their service center charged me Php 2,800 just for installing new OS. I decided to solve this myself because 2.8K is too much just for reinstalling an OS which is supposed to be free. After so many days of troubleshooting, I finally found a way to restore Macbook to factory settings.
So, if you're one of those who have the same problem as I had or did, you can PM me. I will offer my service for only 1,000 pesos. I know it's kinda expensive, but it's cheaper compared to iStore.
Example Errors:
High Sierra Install Fail Loop
MacOS update error
Note: I will not fix macbooks that has broken motherboard. MacBooks that won't turn on. Or has hardware problems. Only software.
I can also apply temporary fix for macbooks with broken video card, most specifically MBP 15" or 17" 2011 model