In Commands.txt line 84 https://github.com/K3V1991/ADB-and-FastbootPlusPlus/blob/57f393704ae1757fbba46ab93c917a722b2e4c56/Commands.txt#L84 says "-user", should be "--user".
In Commands.txt line 84
ADB-and-FastbootPlusPlus/Commands.txt
Line 84 in 57f3937
says "-user", should be "--user".