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To force switching to the other partition from current, unplug the router after ~10 seconds into boot. The main boot partition is 'linux' and the Linksys CFE will also have 'linux2'. To check the boot partitions, run this from telnet or ssh: The XVortex CFE only uses a single linux boot partition. It also has a bug that limits NVRAM to 32KB, for which a third-party XVortex CFE (ported from an Asus RT-AC68U) is available to mitigate. The Linksys CFE partitions flash with two linux boot partitions, switching between them after three (consecutive?) incomplete or failed boots. Once you are on that firmware you can then webflash dd-wrt as usual, and then once you have done this you can telnet into the router and flash the alternate partition so that both partitions have dd-wrt on them. If this happens just login and go to diagnostics and revert to earlier firmware and it will then reboot from the partition with the old Linksys firmware you uploaded. Once you get it uploaded the router may reboot into newer firmware on the other alternate partition. So the best way is to just start clicking the upload button as soon as you see the pings back with the TTL=100 because sometime during that period it will accept tftp from the utility. Unlike other routers where the CFE in the device checks very early in the boot process almost right after power up, the CFE in this router checks for an incoming TFTP much later on. When I did one of these that I picked up used, it pinged probably 25-30 times at the ttl=100 level before the tftp upload blue bar in the Linksys utility started to move. In the ping window is 64, if by then the utility has not uploaded the older Linksys firmware, power cycle the router and start over again.
THis process, from the forum, is as follows:ġ) download an old Linksys oem firmware 1.29 (see the forum thread to download this)ģ) launch the utility and select the Linksys firmware, use admin as the password for the utilityĤ) Set your PC to a static IP and open a ping window, ping 192.168.1.1 -tĥ) Power-cycle the router and click Upload on the utility. The only unlock procedure that I found to work is the one related by bronzemaxwell in the thread referenced which involves back-reving the device to an older Linksys firmware. Note that nowadays virtually all of these devices will have auto-updated themselves to the most current Linksys firmware and so will need to be unlocked.
Please refer to this forum thread for the latest info: "Linksys EA 6900 Install Guide" The XAC1900, which comes as part of a kit with a separate DSL modem (APM105), appears to be the same device as a user has flashed one to the EA6900 firmware.