I have a Sierra MC7455 , when connecting to the RB922UAGS routerboard it does get recognized but not as an LTE interface but rather as a serial device using PPP.
The modem has the USB 3.0 pins taped out, it is running in usbcomp mode 8( verified using swi_switchmode.pl script used on a laptop with a USB/mini-pci adapter) :
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* 8 - DM NMEA AT MBIM SUPPORTED
Device info:
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> system resource print
uptime: 2m14s
version: 7.1beta3 (development)
build-time: Dec/02/2020 15:59:47
factory-software: 6.28
free-memory: 89.7MiB
total-memory: 128.0MiB
cpu: MIPS 74Kc V5.0
cpu-count: 1
cpu-frequency: 720MHz
cpu-load: 0%
free-hdd-space: 111.4MiB
total-hdd-space: 128.0MiB
write-sect-since-reboot: 92
write-sect-total: 7115
bad-blocks: 0%
architecture-name: mipsbe
board-name: RB922UAGS-5HPacD
platform: MikroTik
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> system resource usb print
Columns: DEVICE, VENDOR, NAME, SPEED
# DEV VENDOR NAME SPE
0 2-1 Sierra Wireless, Incorporated Sierra Wireless MC7455 QualcommC2AE SnapdragonE284A2 X7 LTE-A 480
1 1-0 Linux 5.6.3 ehci_hcd RB400 EHCI 480
2 2-0 Linux 5.6.3 ehci_hcd RB400 EHCI 480
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> export
# dec/20/2020 19:21:36 by RouterOS 7.1beta3
# software id = PZZI-24MA
#
# model = 922UAGS-5HPacD
# serial number = 9F880996E072
/interface bridge
add admin-mac=B8:69:F4:21:50:4F auto-mac=no comment=defconf name=bridge
/interface wireless
set [ find default-name=wlan1 ] band=5ghz-a/n/ac channel-width=20/40/80mhz-XXXX disabled=no frequency=auto installation=outdoor mode=ap-bridge ssid=MikroTik-215051
/interface lte apn
set [ find default=yes ] ip-type=ipv4
/interface wireless security-profiles
set [ find default=yes ] supplicant-identity=MikroTik
/ip vrf
add list=all name=main
/port
set 0 name=usb1
/interface ppp-client
add apn=internet name=ppp-out1 port=usb1
/routing table
add fib name=""
/interface bridge port
add bridge=bridge comment=defconf interface=ether1
add bridge=bridge comment=defconf interface=sfp1
add bridge=bridge comment=defconf interface=wlan1
/ip neighbor discovery-settings
set discover-interface-list=*2000003
/ipv6 settings
set disable-ipv6=yes
/ip dhcp-client
add comment=defconf disabled=no interface=bridge
....
