No internet , SIM - Not registered 5G-CPE1801K

[Dev-2021]

Hi there,

I'm new to all this. I recently purchased a 5G-CPE1801K router.
It didn't have support for OpenVPN or WireGuard, so I flashed the "XWRT 5G-CPE1801K" firmware from x-wrt.com.
The process went smoothly, but now I can't access the internet.
The network status shows 87%, and the SIM status is "Not registered" (see attached screenshot).

Device information:
Processor | MT7621A /MIPS Dual core CPU/880MHZ
2.4G+5.8G WIFIchip | MT7905DAN+MT7975DN, IEEE 802.11n/g/b/a/ac/ax, max speed up to 1800Mbps
Memory | DDR3 256MB
Flash Memory | Nand Flash 128MB
Device interface | 1WAN 10/100/1000M RJ45 Ethernet Port(Auto MDI/MDIX)
2LAN 10/100/1000M RJ45 Ethernet Ports(Auto MDI/MDIX)
1Nano SIM slot
1USB2.0

Thank you for your assistance in advance.

[ptpt52]

try QMI

[qilun99]

我也有一台这个路由器，不知道root密码，怎么刷这个x-wrt固件呢