Unfortunately, welcome to the club of all of us who have the same issue after doing the update. I just picked up my MacBook from the apple store after being there for 4 weeks with no resolution. They refused to fix it with the same old claim that liquid was spilled (untruths) and that once I did the update it “stressed” the logic board and that’s why it doesn’t work. Although my MacBook was working perfectly fine until I did the update. I was told to pay $1299 to get it fix which is literally the price to purchase the latest released MacBook. I wasted more than $2000 on the purchase of this MacBook that literally lasted 3 yrs. Apple apparently doesn’t have a solution for this issue and they refused to fix or replace it.