If you have a vendor-specific datasheet (e.g., "Samsung KLUFG8RHDA-B0D1"), follow this workflow:

Additional lanes used in UFS 2.1/3.1 for increased bandwidth. REF_CLK Synchronizes the high-speed interface. Control RESET_N Hardware reset signal. Power Supply VCC , VCCQ , VCCQ2

A standard UFS BGA 254 datasheet includes specific critical signal lines for communication and power. UFS 4.0 | Universal Flash Storage - Samsung Semiconductor