I did some research on openwrt on 192.168.1.1
So what is known at the moment:
Router R281 consists of two devices:
1.Router on a MediaTek MT7621A chip (available at 192.168.1.1)
2. LTE modem on the Marvell pxa1826 chip (it was previously available at 192.168.8.1 when connected via USB via RNDIS connection)
Router and modem have two independent firmware based on different OpenWRT
At the moment, we only have access to the firmware of the router. This is P28PLDT_AP_R281_V004.2 firmware based on Openwrt version 15.05 (chaos calmer) for MT7621
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PLDT adds various opkg packages that are unavailable in the standard openwrt repository. These packages allow some access and information to be obtained from the Marvel lte modem, which is plugged into the router as an RNDIS USB device. In the router, this modem use eth1 interface
To disable the ota, fota, tr069 services, the method of changing the /etc/init.d/services.init file works. Thanks
L E N A R
We can also customize opkg and install any other packages like UI luci, htop, tftp and many more
If you really want to, you can build a new openwrt firmware and reflash the router, but there is not much point in this.
We can send AT commands to the lte modem this allows band lock, cell lock, disable and enable bands.
However, we do not have direct access to the marvel lte modem
LTE Marvel modem has the address 192.168.8.1 however after updating to P28M26HAPLDT_CP_R281_V002.2 is no longer available, has only one open port 53 (DNS)
The lte modem uses a different openwrt firmware based on version 14.07 (Barrier Bracker) for the PXA1826
This firmware has its own additional modules for modem control. In addition, the tr069 and ota services are running there. It is also possible that automatic updates are configured there (fota service)
Therefore, now we need to focus on getting access to the lte modem via 192.168.8.1, otherwise there is a possibility that the modem will be updated in the near future and we will lose the ability to execute AT commands from the router, which means that again goodbye band locking
Having gained access to 192.168.8.1, it will be possible to openline and permanently disable automatic updates and remote control
Probably worth investigating all additional packages that are installed in 192.168.1.1 and through some of them e
there is a possibility to get access to the lte modem or disable the firewall on the modem