SLOW - QMI with Sixfab 3G-4G/LTE Base Shield v2


I have been working on the (3g-4glte-base-shield-v2 HAT) with the (Quectel-EC25-A) modem. I have it on the AT&T network in Chicago. Using a Raspberry Pi 3B+, (Raspbian-Buster image) with original Raspberry Pi power cord.

Everything has been update also using (sudo apt update && sudo apt upgrade)

Install went great following the Sixfab tutorial
I connect just fine however my speed is basically 0.
I get an IP from AT&T Enterprise but if I do a speed test the results are

PING: 121
Download (Mbps): 0.01
Upload (Mbps): 0.00

Is this an AT&T issue, Quectel Modem issue, Raspberry Pi issue, Sixfab HAT issue, or USER issue…???

Here are some out puts.

pi@raspberrypi:~ $ ls /usr/src
linux-headers-4.19.97+ linux-headers-4.19.97-v7+ linux-headers-4.19.97-v7l+ sense-hat

pi@raspberrypi:~/files/quectel-CM $ sudo ./quectel-CM -s
[03-10_13:07:55:727] WCDMA&LTE_QConnectManager_Linux&Android_V1.1.45
[03-10_13:07:55:727] ./quectel-CM profile[1] =, pincode = (null)
[03-10_13:07:55:729] Find /sys/bus/usb/devices/1-1.1.3 idVendor=2c7c idProduct=0125
[03-10_13:07:55:729] Find /sys/bus/usb/devices/1-1.1.3:1.4/net/wwan0
[03-10_13:07:55:730] Find usbnet_adapter = wwan0
[03-10_13:07:55:730] Find /sys/bus/usb/devices/1-1.1.3:1.4/usbmisc/cdc-wdm0
[03-10_13:07:55:730] Find qmichannel = /dev/cdc-wdm0
[03-10_13:07:55:763] cdc_wdm_fd = 7
[03-10_13:07:55:861] Get clientWDS = 19
[03-10_13:07:55:893] Get clientDMS = 1
[03-10_13:07:55:925] Get clientNAS = 3
[03-10_13:07:55:957] Get clientUIM = 1
[03-10_13:07:55:989] Get clientWDA = 1
[03-10_13:07:56:021] requestBaseBandVersion EC25AFAR05A04M4G
[03-10_13:07:56:149] requestGetSIMStatus SIMStatus: SIM_READY
[03-10_13:07:56:149] requestSetProfile[1]
[03-10_13:07:56:213] requestGetProfile[1]
[03-10_13:07:56:245] requestRegistrationState2 MCC: 310, MNC: 410, PS: Attached, DataCap: LTE
[03-10_13:07:56:277] requestQueryDataCall IPv4ConnectionStatus: DISCONNECTED
[03-10_13:07:56:341] requestRegistrationState2 MCC: 310, MNC: 410, PS: Attached, DataCap: LTE
[03-10_13:07:56:372] requestSetupDataCall WdsConnectionIPv4Handle: 0x871f6470
[03-10_13:07:56:436] requestQueryDataCall IPv4ConnectionStatus: CONNECTED
[03-10_13:07:56:469] ifconfig wwan0 up
[03-10_13:07:56:480] busybox udhcpc -f -n -q -t 5 -i wwan0
udhcpc: started, v1.30.1
Too few arguments.
Too few arguments.
udhcpc: sending discover
udhcpc: sending select for
udhcpc: lease of obtained, lease time 7200
Too few arguments.
Too few arguments.


Which antennas are you using?
Did you check the signal strength?

Hi Saeed. I am using the Sixfab ( LTE Antenna SMA – 3dBi ) x2 inside the IP65 IoT enclosure.

Signal strength out put is:

+CSQ: 17,99


I replaced the SIM card and the speed is now better.