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"rtl_test -t" results:

Found 1 device(s):
0: Realtek, RTL2838UHIDIR, SN: 00000001

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6
Sampling at 2048000 S/s.
No E4000 tuner found, aborting.

Okay, with SDR# the device is working well.

Start the scanner, I experienced the same ones, than Pete:

In terminal, after the start:

RTLSDR Scanner

Found Rafael Micro R820T tuner
Found Rafael Micro R820T tuner
Found Rafael Micro R820T tuner
Exact sample rate is: 2000000,052982 Hz
rtlsdr_demod_write_reg failed with -9
r82xx_write: i2c wr failed=-9 reg=06 len=1

I'm confused!
Please, help me anybody!