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DAC+ ADC: no soundcard found (provided script results in error)

I'm setting up Rasp Pi 3 modal A+ with DAC+ ADC and I run the script provided here - https://www.hifiberry.com/build/documentation/deploying-a-new-linux-kernel-onto-a-raspbian-based-system/.

At the very end I get this error:

Enabling kernel in /boot/config.txt
mv: failed to preserve ownership for '/boot/config.txt': Operation not permitted
Removing temporary files

Here's the snippet from /boot/config.txt:

 

# Uncomment some or all of these to enable the optional hardware interfaces
#dtparam=i2c_arm=on
#dtparam=i2s=on
dtparam=spi=on

# Uncomment this to enable the lirc-rpi module
#dtoverlay=lirc-rpi

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)
kernel=kernel7-hb.img
dtoverlay=hifiberry-dacplusadc

So everything seems ok but no soundcard...

From syslog:

 

May 24 04:31:27 souin kernel: [ 3.319706] vc_sm_cma: module is from the staging directory, the quality is unknown, you have been warned.
May 24 04:31:27 souin kernel: [ 3.322101] bcm2835_vc_sm_cma_probe: Videocore shared memory driver
May 24 04:31:27 souin kernel: [ 3.322118] [vc_sm_connected_init]: start
May 24 04:31:27 souin kernel: [ 3.324840] media: Linux media interface: v0.10
May 24 04:31:27 souin kernel: [ 3.336247] [vc_sm_connected_init]: installed successfully
May 24 04:31:27 souin kernel: [ 3.361448] videodev: Linux video capture interface: v2.00
May 24 04:31:27 souin kernel: [ 3.416275] bcm2835_mmal_vchiq: module is from the staging directory, the quality is unknown, you have been warned.
May 24 04:31:27 souin kernel: [ 3.416300] bcm2835_mmal_vchiq: module is from the staging directory, the quality is unknown, you have been warned.
May 24 04:31:27 souin kernel: [ 3.439970] bcm2835_v4l2: module is from the staging directory, the quality is unknown, you have been warned.
May 24 04:31:27 souin kernel: [ 3.494895] bcm2835_codec: module is from the staging directory, the quality is unknown, you have been warned.
May 24 04:31:27 souin kernel: [ 3.514149] snd-rpi-hifiberry-dacplusadc soc:sound: ASoC: CPU DAI (null) not registered - will retry
May 24 04:31:27 souin kernel: [ 3.514594] snd-rpi-hifiberry-dacplusadc soc:sound: ASoC: CODEC DAI pcm512x-hifi not registered - will retry
May 24 04:31:27 souin kernel: [ 3.625105] cfg80211: Loading compiled-in X.509 certificates for regulatory database
May 24 04:31:27 souin kernel: [ 3.710331] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
May 24 04:31:27 souin kernel: [ 3.829324] snd-rpi-hifiberry-dacplusadc soc:sound: ASoC: CODEC DAI pcm512x-hifi not registered - will retry
May 24 04:31:27 souin kernel: [ 3.831965] brcmfmac: F1 signature read @0x18000000=0x15264345
May 24 04:31:27 souin kernel: [ 3.844828] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
May 24 04:31:27 souin kernel: [ 3.845912] snd-rpi-hifiberry-dacplusadc soc:sound: ASoC: CODEC DAI pcm512x-hifi not registered - will retry
May 24 04:31:27 souin kernel: [ 3.846204] usbcore: registered new interface driver brcmfmac
May 24 04:31:27 souin kernel: [ 3.919389] pcm512x 1-004d: Linked as a consumer to regulator.2
May 24 04:31:27 souin kernel: [ 3.921075] snd-rpi-hifiberry-dacplusadc soc:sound: ASoC: CODEC DAI pcm512x-hifi not registered - will retry
May 24 04:31:27 souin kernel: [ 3.921946] snd-rpi-hifiberry-dacplusadc soc:sound: ASoC: CODEC DAI pcm512x-hifi not registered - will retry
May 24 04:31:27 souin kernel: [ 3.925488] snd-rpi-hifiberry-dacplusadc soc:sound: ASoC: CODEC DAI dmic-hifi not registered - will retry
May 24 04:31:27 souin kernel: [ 3.935950] snd-rpi-hifiberry-dacplusadc soc:sound: ASoC: CODEC DAI dmic-hifi not registered - will retry
May 24 04:31:27 souin kernel: [ 4.067604] snd-rpi-hifiberry-dacplusadc soc:sound: multicodec <-> 3f203000.i2s mapping ok
May 24 04:31:27 souin kernel: [ 4.081193] bcm2835-codec bcm2835-codec: Device registered as /dev/video10
May 24 04:31:27 souin kernel: [ 4.081209] bcm2835-codec bcm2835-codec: Loaded V4L2 decode
May 24 04:31:27 souin kernel: [ 4.086701] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6
May 24 04:31:27 souin kernel: [ 4.107031] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4345/6 wl0: Feb 27 2018 03:15:32 version 7.45.154 (r684107 CY) FWID 01-4fbe0b04
May 24 04:31:27 souin kernel: [ 4.110805] bcm2835-codec bcm2835-codec: Device registered as /dev/video11
May 24 04:31:27 souin kernel: [ 4.110828] bcm2835-codec bcm2835-codec: Loaded V4L2 encode
May 24 04:31:27 souin kernel: [ 4.133899] bcm2835-codec bcm2835-codec: Device registered as /dev/video12
May 24 04:31:27 souin kernel: [ 4.133914] bcm2835-codec bcm2835-codec: Loaded V4L2 isp

 

The red led is on on the DAC+ ADC card.

What can I do to make it work?

Thank you!

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