Gerhard Roth helped add support for the original (non-eSIM) Dell DW5821e
device to umb(4) years ago on a Dell Latitude 7300. The Dell Latitude
Rugged 5430 can also be ordered with a Dell DW5821e Snapdragon X20 LTE
card but this one comes with a different USB ID (0x81e0 instead of
0x81d7) and has the eSIM selected as the default SIM out of the box. The
patch below adds support to usbdevs and if_umb.c for this new variant.
If you have this card in a system and want to use a physical SIM like I
do, you have to boot into a recent Ubuntu (I used 24.04 LTS on a USB
drive) or other Linux distro with good mmcli support and run:

sudo mmcli -m 0 --set-primary-sim-slot=1

Once this is done, Ubuntu or OpenBSD will happily connect using a SIM
card in the physical SIM card slot. Your modem could be at slot 1
instead of 0 as above and the physical SIM slot can be 0 in some cases
that people have posted online but, in my case, slot 1 is the physical
SIM and slot 2 is the eSIM. If someone could ok and commit, I would
greatly appreciate it. Thank you.

Bryan


Index: sys/dev/usb/if_umb.c
===================================================================
RCS file: /cvs/src/sys/dev/usb/if_umb.c,v
diff -u -p -u -r1.58 if_umb.c
--- sys/dev/usb/if_umb.c	23 May 2024 03:21:09 -0000	1.58
+++ sys/dev/usb/if_umb.c	25 Jul 2024 02:49:56 -0000
@@ -247,6 +247,12 @@ const struct umb_quirk umb_quirks[] = {
 	  UMATCH_VENDOR_PRODUCT
 	},
 
+	{ { USB_VENDOR_DELL, USB_PRODUCT_DELL_DW5821E_2 },
+	  0,
+	  2,
+	  UMATCH_VENDOR_PRODUCT
+	},
+
 	{ { USB_VENDOR_HUAWEI, USB_PRODUCT_HUAWEI_ME906S },
 	  UMBFLG_NDP_AT_END,
 	  3,
Index: sys/dev/usb/usbdevs
===================================================================
RCS file: /cvs/src/sys/dev/usb/usbdevs,v
diff -u -p -u -r1.766 usbdevs
--- sys/dev/usb/usbdevs	29 May 2024 06:48:43 -0000	1.766
+++ sys/dev/usb/usbdevs	25 Jul 2024 02:46:31 -0000
@@ -1538,6 +1538,7 @@ product DELL W5500		0x8115	W5500 HSDPA 
 product DELL U740		0x8135	U740 CDMA
 product DELL EU870D		0x8138	EU870D HSDPA
 product DELL DW5821E		0x81d7	DW5821e LTE
+product DELL DW5821E_2		0x81e0	DW5821e LTE
 product DELL DW700		0x9500	DW700 GPS
 product DELL2 UPS		0xffff	UPS