Just tried to move from qmi to mbim on the sweet GL-X300B.
I followed the guide, installed all mbim packages, switched on mbim.
The only difference to the well known x3000 is: There is no witch between pcie and usb.
Qmi was working fine, but with mbim I face errors:
Sun Dec 7 14:54:51 2025 daemon.notice netifd: Interface '5G_MODEM' is now down
Sun Dec 7 14:54:51 2025 daemon.notice netifd: Interface '5G_MODEM' is setting up now
Sun Dec 7 14:54:51 2025 daemon.notice netifd: 5G_MODEM (10879): mbim[10879] Reading capabilities
Sun Dec 7 14:54:52 2025 daemon.warn odhcpd[1762]: No default route present, setting ra_lifetime to 0!
Sun Dec 7 14:55:06 2025 daemon.notice netifd: 5G_MODEM (10879): ERROR: mbim message timeout
Sun Dec 7 14:55:06 2025 daemon.notice netifd: 5G_MODEM (10879): mbim[10879] Failed to read modem caps
Sun Dec 7 14:55:21 2025 daemon.notice netifd: 5G_MODEM (10879): ERROR: mbim message timeout
Sun Dec 7 14:55:21 2025 user.notice root: mbim bringup failed, retry in 15s
Sun Dec 7 14:55:37 2025 daemon.notice netifd: 5G_MODEM (10977): mbim[10977] Stopping network
Sun Dec 7 14:55:37 2025 daemon.notice netifd: 5G_MODEM (10977): Command failed: ubus call network.interface notify_proto { "action": 0, "link-up": false, "keep": false, "interface": "5G_MODEM" } (Permission denied)
Sun Dec 7 14:55:37 2025 daemon.notice netifd: Interface '5G_MODEM' is now down
Sun Dec 7 14:55:37 2025 daemon.notice netifd: Interface '5G_MODEM' is setting up now
Sun Dec 7 14:55:37 2025 daemon.notice netifd: 5G_MODEM (10985): mbim[10985] Reading capabilities
Sun Dec 7 14:55:38 2025 daemon.warn odhcpd[1762]: No default route present, setting ra_lifetime to 0!
Sun Dec 7 14:55:52 2025 daemon.notice netifd: 5G_MODEM (10985): ERROR: mbim message timeout
Sun Dec 7 14:55:52 2025 daemon.notice netifd: 5G_MODEM (10985): mbim[10985] Failed to read modem caps
other sources of information:
root@OpenWrt:~# cat /sys/kernel/debug/usb/devices
T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=ef(misc ) Sub=02 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=2c7c ProdID=0125 Rev= 3.18
S: Manufacturer=Quectel
S: Product=EG25-GC
C:* #Ifs= 6 Cfg#= 1 Atr=a0 MxPwr=500mA
A: FirstIf#= 4 IfCount= 2 Cls=02(comm.) Sub=0e Prot=00
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
I:* If#= 1 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E: Ad=83(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
E: Ad=82(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 2 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E: Ad=85(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
E: Ad=84(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=03(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 3 Alt= 0 #EPs= 3 Cls=ff(vend.) Sub=00 Prot=00 Driver=option
E: Ad=87(I) Atr=03(Int.) MxPS= 10 Ivl=32ms
E: Ad=86(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=04(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
I:* If#= 4 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=0e Prot=00 Driver=cdc_mbim
E: Ad=89(I) Atr=03(Int.) MxPS= 64 Ivl=32ms
I: If#= 5 Alt= 0 #EPs= 0 Cls=0a(data ) Sub=00 Prot=02 Driver=cdc_mbim
I:* If#= 5 Alt= 1 #EPs= 2 Cls=0a(data ) Sub=00 Prot=02 Driver=cdc_mbim
E: Ad=88(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=05(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
/etc/config network
config interface '5G_MODEM'
option proto 'mbim'
option apn 'internet'
option pincode '1234'
option auth 'none'
option pdptype 'ipv4v6'
option peerdns '0'
list dns '8.8.8.8'
option device '/dev/cdc-wdm0'