Asus AREZ Strix Radeon RX VEGA56

Hello and thanks for all your fabulous work.

I'm trying to change leds of my Asus AREZ Strix Radeon RX VEGA56 following the wiki.

I'm using an Asrock X570 Phantom Gaming 4 as motherboard.

From i2cdetect I got:

$ sudo i2cdetect -l
i2c-3   i2c             dmdc                                    I2C adapter
i2c-1   smbus           SMBus PIIX4 adapter port 2 at 0b00      SMBus adapter
i2c-8   i2c             AMDGPU DM i2c hw bus 4                  I2C adapter
i2c-6   i2c             AMDGPU DM i2c hw bus 2                  I2C adapter
i2c-4   i2c             AMDGPU DM i2c hw bus 1                  I2C adapter
i2c-2   i2c             AMDGPU DM i2c hw bus 0                  I2C adapter
i2c-0   smbus           SMBus PIIX4 adapter port 0 at 0b00      SMBus adapter
i2c-7   i2c             AMDGPU DM i2c hw bus 3                  I2C adapter
i2c-5   i2c             dmdc                                    I2C adapter

I haven't patched the kernel, I'm on Linux 5.5.13, and I see the second SMBus, so I don't think I need it?

I detected the devices and I make the dump at the different addresses (0x29, 0x2A, and 0x60) but all I get are "ff".

What I'm doing wrong? What should I see from the dump?

Thanks in advance.