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Fanstel BT840F not connecting.

Morning. I have a Fanstel840F module.
I use attached example sketch.
I flash nrf52DK with this sketch, it works fine. I can scan with NRF PC and Mobile software, and see smartTag1003 in scan list.
I can connect.
Now the Fanstel 840F module.
I can flash OK.
If I scan with NRF PC or Mobile, I can see smartTag1003 under scan list.
I cannot connect, says HCI error.

I use zephyr.
I have overlay file:

/{
model = "Nordic nRF52840 DK NRF52840";
compatible = "nordic,nrf52840-dk-nrf52840";

buttons {
compatible = "gpio-keys";
button0: button_0 {
gpios = <&gpio0 11 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>;
label = "Push button switch 0";
};
button1: button_1 {
gpios = <&gpio0 2 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>;
label = "Push button switch 1";
};
button2: button_2 {
gpios = <&gpio0 24 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
label = "Push button switch 2";
};
button3: button_3 {
gpios = <&gpio0 25 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
label = "Push button switch 3";
};
};

/* These aliases are provided for compatibility with samples */
aliases {
led0 = &led0;
led1 = &led1;
led2 = &led2;
led3 = &led3;
pwm-led0 = &pwm_led0;
sw0 = &button0;
sw1 = &button1;
sw2 = &button2;
sw3 = &button3;
};

};

&gpio0 {
status = "okay";
};

&gpio1 {
status = "okay";
};

&uart0 {
compatible = "nordic,nrf-uart";
status = "okay";
current-speed = <115200>;
tx-pin = <6>;
rx-pin = <8>;
rts-pin = <5>;
cts-pin = <7>;
};

&uart0 {
status = "okay";
};

My first guess is maybe crystal? I understand the BT840F does not have crystal? ( I do not know how to set in zephyr to use internal crystal.
My second guess is Fanstel and NRF52840 DK hardware configs clash..

Please help.

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