EC25-AF only see DM port both linux and Windows

Technical Subjects
1

Hello,
I recently purchased an EC25-AF miniPCIE module. I have installed in my laptop running linux.
I only see /dev/ttyUSB0 and when I try to send AT commands to this port, the module only returns the “0” character over serial. I have tried all possible baud rates.

I switch over to Windows on the same laptop. Initially windows does not detect the device. I install the windows 5g + LTE serial drivers and the device shows up.
Unfortunately I also only see a single serial port associated with this device. In device manager, it states it is the DM port of this modem module.

I do not have access to the AT port to which I can send troubleshooting commands for this device.

It seems that I have the key to the castle but can not find the door that it opens.
This is incredibly frustrating.

I appreciate any guidance you may have

2

cat /sys/kernel/debug/usb/devices

3

This is the entry that corresponds with the module.

T:  Bus=02 Lev=02 Prnt=02 Port=03 Cnt=03 Dev#= 20 Spd=480  MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=2c7c ProdID=0125 Rev= 0.00
S:  Manufacturer=Qualcomm CDMA Technologies MSM
S:  Product=QHSUSB__BULK
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=  2mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=option
E:  Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E:  Ad=01(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
4

See EG25 reboots into broken QHSUSB__BULK mode