This is how to unlock Samsung S8 Plus with android version 8.0.0.
First you must enable OEM unlock and USB debugging. Type *#0808# and choose the last option. Connect usb and install necessary drivers.
Open samkey version 1836. Input username and password. It will cost 3 credits.
Finally click read codes and follow instructions.
After calculating the unlock code, put non-accepted sim on the phone. It will ask unlock code. Just simply input the network code generated by samkey software.
As simple as 123!
For samkey credits contact me.
+63932-4381156
+639270855545
fb: Ariel Z. Bascos