Ok ok, I seem to have misunderstood the question. It’s because the CM4 has been designed to only use the built in antenna on the board, unless specified differently. And as far as I know this only applies to the CM4. But as @ogiewon already stated, I’m not sure if this actually translates/works with HAOS. Here you have a blog post from Jeff Geerling that explains the process:
Check out this site. That’s how I got mine quickly: https://rpilocator.com
Filter by CM4 and your region.
I got mine now and just migrated from my Raspi 4. It was completely painless due to this wonderful tutorial by Lewis: Getting Started With Home Assistant Yellow! - YouTube.
Highly recommend his channel in any case.
Yes that is my setup, however no time yet to test. I recommend getting a (or a few if you have a larger home) ESP32s and set them up as BT proxies: ESPHome Bluetooth Proxy That is my next to do.
Yes that would have been nice, but it doesn’t work for me. I generally only need BT for my Mi Flora sensors and they unfortunately do not play nice together with the proxies. I’ve tried different ESP32s with different proxy settings, but eventually they just turn unavailable. They work perfectly with my BT dongle. 
How did you configure the CM4 to use the external antenna? Did you edit the config file? And what’s roughly the range of the antenna in your home?
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Yes, I know. But the Mi Flora component does not support the battery sensor, since it’s passive. The battery sensor requires active BT communication.
Or the older firmware 
There are posts claiming otherwise, perhaps post an issue if it is not working for you.
Well when I bought them they had the old firmware and that didn’t work at all.
Already did. Could you please point me to these posts?
Edit: Never mind, found some.
Replying to myself. Samsung 980 500GB works!
➜ ~ dmesg | grep nvme
[ 1.212386] nvme nvme0: pci function 0000:01:00.0
[ 1.212541] nvme 0000:01:00.0: enabling device (0000 -> 0002)
[ 1.221640] nvme nvme0: Shutdown timeout set to 8 seconds
[ 1.237086] nvme nvme0: allocated 64 MiB host memory buffer.
[ 1.609890] nvme nvme0: 4/0/0 default/read/poll queues
[ 1.650561] nvme0n1: p1
[ 54.713438] EXT4-fs (nvme0n1p1): mounted filesystem with ordered data mode. Opts: commit=30. Quota mode: none.
[ 54.828654] EXT4-fs (nvme0n1p1): resizing filesystem from 7455483 to 122096384 blocks
[ 55.614051] EXT4-fs (nvme0n1p1): resized filesystem to 122096384
➜ ~ lspci -nnvv -s 01:00.0
01:00.0 Non-Volatile memory controller [0108]: Samsung Electronics Co Ltd Device [144d:a809] (prog-if 02 [NVM Express])
Subsystem: Samsung Electronics Co Ltd Device [144d:a801]
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0
Interrupt: pin A routed to IRQ 46
Region 0: Memory at 600000000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
Capabilities: [50] MSI: Enable- Count=1/32 Maskable- 64bit+
Address: 0000000000000000 Data: 0000
Capabilities: [70] Express (v2) Endpoint, MSI 00
DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s unlimited, L1 unlimited
ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ SlotPowerLimit 0W
DevCtl: CorrErr- NonFatalErr- FatalErr- UnsupReq-
RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+ FLReset-
MaxPayload 128 bytes, MaxReadReq 512 bytes
DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr- TransPend-
LnkCap: Port #0, Speed 8GT/s, Width x4, ASPM L1, Exit Latency L1 <64us
ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 5GT/s (downgraded), Width x1 (downgraded)
TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Range ABCD, TimeoutDis+ NROPrPrP- LTR+
10BitTagComp- 10BitTagReq- OBFF Not Supported, ExtFmt- EETLPPrefix-
EmergencyPowerReduction Not Supported, EmergencyPowerReductionInit-
FRS- TPHComp- ExtTPHComp-
AtomicOpsCap: 32bit- 64bit- 128bitCAS-
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LTR+ 10BitTagReq- OBFF Disabled,
AtomicOpsCtl: ReqEn-
LnkCap2: Supported Link Speeds: 2.5-8GT/s, Crosslink- Retimer- 2Retimers- DRS-
LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis-
Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
Compliance Preset/De-emphasis: -6dB de-emphasis, 0dB preshoot
LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1-
EqualizationPhase2- EqualizationPhase3- LinkEqualizationRequest-
Retimer- 2Retimers- CrosslinkRes: unsupported
Capabilities: [b0] MSI-X: Enable+ Count=13 Masked-
Vector table: BAR=0 offset=00003000
PBA: BAR=0 offset=00002000
Capabilities: [100 v2] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout+ AdvNonFatalErr-
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- AdvNonFatalErr+
AERCap: First Error Pointer: 00, ECRCGenCap+ ECRCGenEn- ECRCChkCap+ ECRCChkEn-
MultHdrRecCap+ MultHdrRecEn- TLPPfxPres- HdrLogCap-
HeaderLog: 00000000 00000000 00000000 00000000
Capabilities: [148 v1] Device Serial Number 00-00-00-00-00-00-00-00
Capabilities: [158 v1] Power Budgeting <?>
Capabilities: [168 v1] Secondary PCI Express
LnkCtl3: LnkEquIntrruptEn- PerformEqu-
LaneErrStat: 0
Capabilities: [188 v1] Latency Tolerance Reporting
Max snoop latency: 0ns
Max no snoop latency: 0ns
Capabilities: [190 v1] L1 PM Substates
L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+
PortCommonModeRestoreTime=10us PortTPowerOnTime=10us
L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1-
T_CommonMode=0us LTR1.2_Threshold=25600ns
L1SubCtl2: T_PwrOn=10us
Kernel driver in use: nvme
Oh ok. that ain’t good. In fact I have a bunch of Miflora sensors which I connect via Plantgateway running on a Pi Zero and another Pi. It works generally well but I was planning to move to the BT Proxy solution soon because then I don’t have to deal with the MQTT workaround and can connect them directly to HA. Also what is annoying that when you restart the HA it takes quite a while until the plant gateway sends data again (if you don’t trigger manually). I guess I will try it and see if it works as I already have the ESPs lying around.
@hesspoint Interresting, didn’t know that this existed. I personally use MQTT quite a lot, especially for my Zigbee network. So that wouldn’t bother me at all, perhaps I’ll try this as well.
Feel free to get back with an update on how your BT proxy experience was/is. 
Hi Jump, just started using my Yellow, great device. The problem I have is that the zigbee radio seems very weak. Only works at a 2-3 meters. When I plug in the sonoff zigbee stick I get range of 15 m
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Ouch that’s not good. I have an external antenna on my ZigBee stick too. Hopefully it’s possible to modify the home Assistant SkyConnect to extend the range.
Same here , terrible connections , am using a conbee II now, works fine
Then read this thread, I only heard about it in this thread.