Linksys E4200
From DD-WRT Wiki
Contents |
[edit] Hardware Specifications
CPU | Broadcom BCM4718 |
---|---|
CPU Speed | 480 MHz |
Flash ROM | 16 MB Macronix MX25L12845E |
RAM | 64 MB |
Radios | 2.4 GHz, 5 GHz |
WLAN Support | a/b/g/n |
WLAN Max Speed | 300mbps (2.4 GHz) & 450mbps (5 GHz) |
Antenna Location | Internal (x6) |
Bands | 3 x 3 |
Radio wl0 | Broadcom 4718 (SoC) |
Radio wl1 | Broadcom 4331 Intensi-fi Single-Chip 802.11n Transceiver |
Switch | 4x GigE + 1 WAN Broadcom 53115 IEEE 802.3/3u/3ab |
USB | 1x USB 2.0 |
[edit] Flashing
[edit] Warnings
These instructions are for E4200 version 1 ONLY! Version 2 has a marvel chipset and is NOT supported
- The E4200 uses nv60k builds, do NOT flash nv64k nor generic builds.
- To upgrade stock firmware to DD-WRT, use the Flashing procedure below. Only use trailed builds (with E4200 in the file name) to avoid bricking.
- AFTER initial flash, only use trailed OR nv60k builds - NOT nv64k nor generic builds.
- K3X is recommended once you are running dd-wrt - only use a trailed build to flash from K26 to K3X
- Newer K3X builds may not have a nv60k.bin build, in this case use the trailed build for upgrades
- Recovery from firmware with the wrong nvram size requires use of a JTAG cable to erase the nvram.1
- The E4200 works very well with most newer builds >32XXX, see Where do I download firmware? for links.
- Read model-specific and New Build threads before flashing different firmware
- The E4200 dissipates a good deal of heat at the stock 100 mW transmit power
- Ensure adequate cooling or reduce transmit power to 40-50 mW.
[edit] Initial Flash
To install DD-WRT, perform these steps from the stock Linksys GUI:
- Read all of the required Peacock announcement.
- Disconnect any Ethernet cables from router and PC, and disable PC wireless.
- Reset the router.
- Connect Ethernet cable from a LAN port (not the Internet port) of the router to PC doing the flash.
- Wait for router to boot up, and then for PC to get DHCP address from the router.
- Open router GUI (192.168.1.1) in Web browser on PC.
- Flash an E4200-specific mini build; e.g., 21676 trailed initial flash build for E4200
- Do NOT use a "nv60k" build for the initial flash; only use a trailed build, such as above.
- 21676 is a stable, recommended build for the E4200, but only use the mini version, since larger versions have the dangerous Heartbleed vulnerability. If you need more functionality than mini, upgrade to a newer build, see Where do I download firmware? for links.
- Wait for flashing process to complete, then wait 3 more minutes.
- Reset the device after it has successfully updated.
- Wait for router to boot up, then log into DD-WRT Web interface (192.168.1.1).
- If the browser GUI login does not display, clear the browser cache.
[edit] Upgrading
- To upgrade to other builds AFTER installing DD-WRT, ONLY flash nv60k (or trailed) builds
WARNING: Flashing anything else may result in a brick, as noted above
- Select the build of your choosing from the the following link: Where do I download firmware?
- After the initial flash of a K26 build, you can upgrade to K26 mega build or K3X mega (broadcom_K3X folder). K3X mega is the recommended build version for this router, and supports SFE accelerated NAT after build 33006.
- Follow the same flashing procedure as you used for the initial flash
[edit] Reverting to stock firmware
You can always revert back to stock firmware.
- Download the latest E4200 firmware from the Linksys website.
- Disconnect all cables and wireless clients.
- Perform a 30/30/30 reset on the device.
- Login and select the stock firmware file and flash, make sure to select "reset to defaults" on the drop down menu when flashing.
- Wait approximately 5 minutes for the flashing process to complete.
- Perform a 30/30/30 after the device has successfully updated.
[edit] Wireless-N Configuration
- As is explained in Wireless-N Configuration make sure that you use AES with WPA2 security for your wireless N network. Do not use TKIP or the wireless speed will revert to the g standard and that would be a pity. (AES+TKIP is also allowed but not recommended.)
- It is recommended to set:
- 2.4 GHz radio to "NG-Mixed".
- 5 GHz radio to "NA-Mixed".
- Both 2.4 and 5 GHz Radios run at a stock transmitting power of 100mW. Decreasing the transmitting power to a value between 40 & 50mW may help stability, especially if the router has poor cooling.
[edit] References
- e4200 build thread at dd-wrt forum
- FCC disclosures