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Warning, before installing LEDE/OpenWrt the fist time:
if the currently running linksys firmware is < 220.127.116.11978 install (at least) 18.104.22.168978 twice to make sure the primary and the secondary partition have a compatible format
install (at least) 22.214.171.124978 once to make sure that the secondary/backup partition is compatible with OpenWrt/LEDE as well
some users have reported that 1.1.4* versions do not boot, so installing a 1.1.3* firmware may be needed.
Note: Reset router to factory defaults if it has been previously configured.
Browse to http://192.168.1.1/Upgrade.asp
Upload .bin file to router
Wait for it to reboot
Note: It's possible that the more recent stock firmware may have changed the interface so that the above link (http://192.168.1.1/Upgrade.asp) no longer works. On version 126.96.36.199977 for example, in the stock WebUI, you have to go to Connectivity → Basic (tab) → Router Firmware Update → Manual Update → Choose File. See this screenshot:
To install via TFTP, opening the router is needed. On older models, serial headers seem to be populated, but reports say that newer models do not have populated serial headers. If the firmware build is newer than version 1.1.3, please follow the guide below to flash an older version, substituting A 188.8.131.52845 image for the DD-WRT image. Once an older version is flashed, simply install OpenWrt via webupgrade as usual.
Going back to Linksys Firmware / Flashing back to stock
You will need SSH access to the device as Web UI flashing page will reject stock firmware. You will also need version 184.108.40.206978 of the stock firmware and not anything later (like 220.127.116.11908).
Upload the stock firmware file to /tmp/ directory on the router and then run:
sysupgrade -n -v -F /tmp/FW_EA8500_18.104.22.168978_prod.
→ Basic configuration After flashing, proceed with this.
Set up your Internet connection, configure wireless, configure USB port, etc.
The default network configuration is:
LAN & WiFi
LAN ports (1 to 4)
WiFi (2.4 GHz)
WiFi (5 GHz)
Switch Ports (for VLANs)
Numbers 1-4 are Ports 1-4 as labeled on the unit, number 5 is the Internet (WAN) on the unit, 0 is the internal connection to the router CPU.
→ hardware.button on howto use and configure the hardware button(s).
Here, we merely name the buttons, so we can use them in the above Howto.
To open the box first remove 4 rubber feet covering screws (I found that trying to push them towards the middle of the box helps). Remove 4 Philips screws. Unlike some earlier Linksys devices there are also plastic clips holding the top cover in place. Use plastic prying tools to detach the cover. While on the sides the clips disengage with the slim prying tool, both front and back require prying tool pushed well into the box. Be careful to not rip any wires inside.
Main PCB: Insert photo of PCB
→ port.serial general information about the serial port, serial port cable, etc.
How to connect to the Serial Port of this specific device:
Pins are marked 1-5 on PCB, use the following:
PIN 2: RX
PIN 3: TX
PIN 5: GROUND
Serial connection parameters
for Linksys EA8500 V1