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wget https://github.com/winterheart/broadcom-bt-firmware/blob/master/brcm/BCM20702A1-0a5c-216f.hcd[
sudo cp BCM20702A1-0a5c-216f.hcd /lib/firmware/brcm

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sudo dmesg | grep -i bluetooth; sudo dmesg | grep -i firmware;

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ls -l /lib/firmware/brcm | grep BCM20702A1

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wget https://github.com/winterheart/broadcom-bt-firmware/blob/master/brcm/BCM20702A1-0a5c-216f.hcd[
sudo cp BCM20702A1-0a5c-216f.hcd /lib/firmware/brcm

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mumu@MyXps:~$ wget https://github.com/winterheart/broadcom-bt-firmware/blob/master/brcm/BCM20702A1-0a5c-216f.hcd[
AVERTISSEMENT: les métacaractères ne sont pas supportés en HTTP.
--2021-09-11 11:51:45--  https://github.com/winterheart/broadcom-bt-firmware/blob/master/brcm/BCM20702A1-0a5c-216f.hcd[
Résolution de github.com (github.com)... 140.82.121.3
Connexion vers github.com (github.com)|140.82.121.3|:443... connecté.
requête HTTP transmise, en attente de la réponse... 404 Not Found
2021-09-11 11:51:46 ERREUR 404: Not Found.

mumu@MyXps:~$ sudo cp BCM20702A1-0a5c-216f.hcd /lib/firmware/brcm

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wget https://github.com/winterheart/broadcom-bt-firmware/blob/master/brcm/BCM20702A1-0a5c-216f.hcd

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mumu@MyXps:~$ sudo dmesg | grep -i bluetooth; sudo dmesg | grep -i firmware;
[    5.182017] Bluetooth: Core ver 2.22
[    5.182047] Bluetooth: HCI device and connection manager initialized
[    5.182050] Bluetooth: HCI socket layer initialized
[    5.182053] Bluetooth: L2CAP socket layer initialized
[    5.182057] Bluetooth: SCO socket layer initialized
[    5.478377] Bluetooth: hci0: BCM: chip id 63
[    5.479377] Bluetooth: hci0: BCM: features 0x07
[    5.495381] Bluetooth: hci0: MyXps
[    5.496375] Bluetooth: hci0: BCM20702A1 (001.002.014) build 0000
[    5.496901] bluetooth hci0: Direct firmware load for brcm/BCM20702A1-0a5c-216f.hcd failed with error -2
[    5.496905] Bluetooth: hci0: BCM: Patch brcm/BCM20702A1-0a5c-216f.hcd not found
[    6.739031] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[    6.739033] Bluetooth: BNEP filters: protocol multicast
[    6.739037] Bluetooth: BNEP socket layer initialized
[    9.048610] Bluetooth: RFCOMM TTY layer initialized
[    9.048616] Bluetooth: RFCOMM socket layer initialized
[    9.048623] Bluetooth: RFCOMM ver 1.11
[ 2907.278283] Bluetooth: hci0: BCM: chip id 63
[ 2907.279293] Bluetooth: hci0: BCM: features 0x07
[ 2907.295308] Bluetooth: hci0: BCM20702A
[ 2907.296299] Bluetooth: hci0: BCM20702A1 (001.002.014) build 0000
[ 2907.296336] bluetooth hci0: Direct firmware load for brcm/BCM20702A1-0a5c-216f.hcd failed with error -2
[ 2907.296338] Bluetooth: hci0: BCM: Patch brcm/BCM20702A1-0a5c-216f.hcd not found
[    0.000000] [Firmware Bug]: TPM Final Events table missing or invalid
[    0.113947] Spectre V2 : Enabling Restricted Speculation for firmware calls
[    5.496901] bluetooth hci0: Direct firmware load for brcm/BCM20702A1-0a5c-216f.hcd failed with error -2
[ 2907.296336] bluetooth hci0: Direct firmware load for brcm/BCM20702A1-0a5c-216f.hcd failed with error -2

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mumu@MyXps:~$ ls -l /lib/firmware/brcm | grep BCM20702A1
-rw-r--r-- 1 root root   35080 sept. 11 11:51 BCM20702A1-0a5c-216f.hcd