I was tall about the original one.before it was work but if i was shout it out with the charger connected and turn it on it wasn't work! other way it was work ok.
Didn't know i will check tomorrow, thanks.Be aware, I think there is a difference between 2016/17 SSD type.
820-00840 being the 2017 model, it shouldn't be a problem.After extensive testing with every Gen. 5A drive we could get our hands on, it appears that 128GB SSDs with part numbers beginning with 656-0074 and 256GB SSDs with part numbers beginning with 656-0076 are only compatible with the model A1708 laptops from the Mid 2017 release.