You'd need to resort to a JTAG, or other low-level interface and read the data off the flash chip directly. Sometimes it is possible to create an alternative firmware that can be run from RAM directly. You'd need a serial console access to the bootloader, interrupt the boot process and then find some way to upload your alternative RAM-based firmware into the router's memory before executing it. Then you'd essentially be running the firmware in "live" mode where you can access the hardware resources on the router, but your changes will not be persisted over power cycles. If you manage to build a suitable firmware image for your router and start it up, then you can read data from the MTD device objects and store them into a temporary file in the memory-based file system that the "live" image is using. Then start up a TFTP server and transfer the file away.H108N ADSL2/ADSL2+ Modem H108N is a powerful ADSL2/ADSL2+(Annex A/B alternative) modem which can provide the maximum speed up to 300Mbps wireless experience. One optional USB 2.0 host port can offer the multiple services including DLNA, UPnP, 3G dongle, etc. ZXHN H108N is an ADSL access device to support multiple line modes. It supports ADSL2/ADSL2+ and is backward compatible to ADSL, even offers auto-negotiation capability for different flavors (G.dmt, T1.413 Issue 2) according to central office DSLAM’s settings (Digital Subscriber Line Access Multiplexer). It provides four 10/100Base-T Ethernet interfaces and one USB 2.0 Host interface. It supports IEEE 802.11 b/g/n Wi-Fi interfaces. #ZXHN H108N V2.5 FIRMWARE UPDATE UPGRADE#.#ZXHN H108N V2.5 FIRMWARE UPDATE SERIAL#.#ZXHN H108N V2.5 FIRMWARE UPDATE INSTALL#. #ZXHN H108N V2.5 FIRMWARE UPDATE HOW TO#.
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