you can look which pins your modem uses from the ngff slot and compare with bpi-r4 schematics…maybe there is a difference
see pins 30-36 (even pins)
According to the Modem hardware design document the pin looks same. But i don’t know if there any differences cause i don’t know about electrical thing. 
Here the link for hardware design document(Page39).
Fibocom FM350GL works with with BPI-R4? What kind of configuration you run on BPI-R4?
That’s an image from Openwrt forum…
To me it seems that most modems expect the SIM-detection signal to be inverted. For the FM350-GL there is a AT command which allows you to ignore the SIM-detection signal, then it works on the R4 as PCIe device.
I have t99w175 (or something like that, writing from memory). Cheap version from Aliexpress for 50-60 USD. It works correctly. Was able to have modemmanager with it and openwrt. Have also Fibocom 350, but this still wait - was not able to have modem manager with it, so for the time being it is postponed. Additional question, when you put sim card and modem is on, do you have additional led light? I think it is blue.
The only modems worth buying are Quectel 5G modems, all other brands or modems are garbage and a waste of money.
What is the difference between the RM520N-GL AA and AP models?
Ø For RM520NGLAA, default communication interface is USB, PCle is disabled but could be enabled by AT command.
Ø For RM520NGLAP, default communication interface is PCle, USB is disabled and cannot be used.
i agreed with you. Its has problem with SIM detection with on board SIM Slot. I order this M.2(NGFF) Key B Adapter with SIM Card for 3G/4G/5G Module expansion board and insert the sim in the the expansion board, the modem manager pickup the sim on the expansion board.
Expansion Board:
Modem Manager:
root@GFriendWRT:/# mmcli -L
/org/freedesktop/ModemManager1/Modem/0 [generic] RM520N-GL
root@GFriendWRT:/# mmcli -m 0
------------------------------------
General | path: /org/freedesktop/ModemManager1/Modem/0
| device id: 0488c1e012b820b06cd784e5e7e6b543edbb972e
------------------------------------
Hardware | manufacturer: generic
| model: RM520N-GL
| firmware revision: RM520NGLAPR01A03M4G
| carrier config: ROW_Commercial
| carrier config revision: 0A010809
| h/w revision: RM520N-GL
| supported: gsm-umts, lte, 5gnr
| current: gsm-umts, lte, 5gnr
| equipment id: xxxxxxxxxxxxxxxxxx
------------------------------------
System | device: /sys/devices/platform/soc/11280000.pcie/pci0003:00/0003:00:00.0/0003:01:00.0
| physdev: /sys/devices/platform/soc/11280000.pcie/pci0003:00/0003:00:00.0/0003:01:00.0
| drivers: mhi_net, mhi-pci-generic
| plugin: generic
| primary port: wwan0mbim0
| ports: mhi_hwip0 (net), mhi_swip0 (net), wwan0mbim0 (mbim),
| wwan0qcdm0 (ignored)
------------------------------------
Status | lock: sim-pin2
| unlock retries: sim-pin2 (3)
| state: enabled
| power state: on
| signal quality: 0% (recent)
------------------------------------
Modes | supported: allowed: 3g; preferred: none
| allowed: 4g; preferred: none
| allowed: 3g, 4g; preferred: 4g
| allowed: 3g, 4g; preferred: 3g
| allowed: 5g; preferred: none
| allowed: 4g, 5g; preferred: 5g
| allowed: 4g, 5g; preferred: 4g
| allowed: 3g, 5g; preferred: 5g
| allowed: 3g, 5g; preferred: 3g
| allowed: 3g, 4g, 5g; preferred: 5g
| allowed: 3g, 4g, 5g; preferred: 4g
| allowed: 3g, 4g, 5g; preferred: 3g
| current: allowed: 3g, 4g, 5g; preferred: 5g
------------------------------------
Bands | supported: utran-1, utran-4, utran-6, utran-5, utran-8, utran-2,
| eutran-1, eutran-2, eutran-3, eutran-4, eutran-5, eutran-7, eutran-8,
| eutran-12, eutran-13, eutran-14, eutran-17, eutran-18, eutran-19,
| eutran-20, eutran-25, eutran-26, eutran-28, eutran-29, eutran-30,
| eutran-32, eutran-34, eutran-38, eutran-39, eutran-40, eutran-41,
| eutran-42, eutran-43, eutran-46, eutran-48, eutran-66, eutran-71,
| utran-19, ngran-1, ngran-2, ngran-3, ngran-5, ngran-7, ngran-8,
| ngran-12, ngran-13, ngran-14, ngran-18, ngran-20, ngran-25, ngran-26,
| ngran-28, ngran-29, ngran-30, ngran-38, ngran-40, ngran-41, ngran-48,
| ngran-66, ngran-70, ngran-71, ngran-75, ngran-76, ngran-77, ngran-78,
| ngran-79
| current: utran-1, utran-4, utran-5, utran-8, utran-2, eutran-1,
| eutran-2, eutran-3, eutran-4, eutran-5, eutran-7, eutran-8,
| eutran-12, eutran-13, eutran-14, eutran-17, eutran-18, eutran-19,
| eutran-20, eutran-25, eutran-26, eutran-28, eutran-29, eutran-30,
| eutran-32, eutran-34, eutran-38, eutran-39, eutran-40, eutran-41,
| eutran-42, eutran-43, eutran-46, eutran-48, eutran-66, eutran-71,
| utran-19, ngran-1, ngran-2, ngran-3, ngran-5, ngran-7, ngran-8,
| ngran-12, ngran-13, ngran-14, ngran-18, ngran-20, ngran-25, ngran-26,
| ngran-28, ngran-29, ngran-30, ngran-38, ngran-40, ngran-41, ngran-48,
| ngran-66, ngran-70, ngran-71, ngran-75, ngran-76, ngran-77, ngran-78,
| ngran-79
------------------------------------
IP | supported: ipv4, ipv6, ipv4v6
------------------------------------
3GPP | imei: xxxxxxxxxxxxxxxxxxxxxx
| enabled locks: fixed-dialing
| registration: idle
------------------------------------
3GPP EPS | initial bearer ip type: ipv4v6
------------------------------------
3GPP 5GNR | mico mode: unsupported
| drx cycle: unsupported
------------------------------------
SIM | primary sim path: /org/freedesktop/ModemManager1/SIM/0
| sim slot paths: slot 1: /org/freedesktop/ModemManager1/SIM/0 (active)
| slot 2: none
I have module FM350GL but i doesnt have time to test with BPIR4. Yesterday i tried the module in BPIR4 with modem manager, the module works in modem manager.
When i put the sim card and on the BPIR4 the blue led light only flash once with booting process after the booting process complete the led doesnt light up.
I’ve read about T99W175 too but i not sure which version should i buy. Because T99W175 had many version. I saw another forum this module cloud work with USB but required some MODS. On your setup do you run the module in PCIe or USB protocol?
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Thank you for sharing the info. I knew that the RM520NGLAA will work in most board because it has the USB line. The reason i choose RM520NGLAP because i had this module laying around and just want to test if the BPIR4 compatible with the PCIe only Modem. It also will be cheaper alternative if the RM520NGLAP work in BPIR4.
Still fighting with this and losing.
- Quectel EM120R-GL (PCIE) - SIM not detected. LED blinks briefly on boot.
- Quectel EM060K-GL (USB) - SIM LED stays on but SIM not detected.
(SIM was actually detected once after resetting the Modem)
- Huawei ME936 (USB) - SIM LED stays on but SIM is not detected.
I was really hoping the EM120R-GL would work but no luck except perhaps with an eSIM.
I really hope it’s not only compatible modules that work with this.
This problem may cause by sim pin detection or sim slot confinguration in quectel module. Can you share these AT Command response for EM120R.
AT+QUIMSLOT?
AT+QSIMDET?
AT+QSIMSTAT?
From what I see in PCIE mode, there’s no AT interface on the EM120R or I’m missing something in my setup.
Had no luck with mbimcli ATR as well.
Hi,
thanks for the answer,
i also was hit by this problem (at R3 with EC25).
It is possible with AT commands to turn the detection around. First time I played with it, I thought, is “just” for the status indication.
BUT it is not just for notification. If detection is wrong set, you get immidiatly after turning in the SIM card, a information that there is no SIM-Card inside (if notification is activated). The software is not even trying to connect because there is no SIM Card inside (in the systems view).
PS: I thing the notification “SIM not detected” can also be caused by other problems. After my first trys, i came to the conclusion, that it is may better not to install all packages … just what you want to try.
if you manage to get the AT Command, for EM120R you have to disable sim pin detection. According to the AT Command document by Quectel, EM120R sim pin detection was enable by default.
To disable the sim pin detection run these AT command then restart the module.:
1.Switch to sim slot 1:
AT+QUIMSLOT=1
2.Disable sim pin detection:
AT+QSIMDET=0,0
3.Restart Module:
AT+CFUN=1,1
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Thank you. I’ll try this out. Hopefully I can get an AT interface up.
Thanks. This resolved the issue on the EM060K-GL.
The EM120R-GL is still a problem with no AT interface.
Still hunting for a way to set it up. 
-----------------------------------
SIM | primary sim path: /org/freedesktop/ModemManager1/SIM/0
| sim slot paths: slot 1: /org/freedesktop/ModemManager1/SIM/0 (active)
| slot 2: none
-----------------------------------
This worked after getting an AT interface using Quectel’s MHI driver.
And persisted on OpenWRT using mhi* drivers.
FCC locking can also be turned off using:
AT+QCFG="fcc_enable",0
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