Linksys E4200
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* The E4200 is very sensitive to the nvram size. | * The E4200 is very sensitive to the nvram size. | ||
- | * For the initial flash, upgrading stock firmware to DD_WRT use Flashing process procedure below!! Please follow it to to prevent a brick | + | * For the initial flash, upgrading stock firmware to DD_WRT use Flashing process procedure below!! Please follow it to to prevent a brick only use trailed builds |
- | + | ||
** A trailed build has "E4200" in its name like: dd-wrt.v24-18777_NEWD-2_K2.6_mini-'''e4200'''.bin | ** A trailed build has "E4200" in its name like: dd-wrt.v24-18777_NEWD-2_K2.6_mini-'''e4200'''.bin | ||
+ | * The only safe builds which can be used''' AFTER''' initial flash for this router are ''' nv60 builds''' | ||
** A NV60 build in its name like: dd-wrt.v24-18777_NEWD-2_K2.6_big-'''nv60'''.bin | ** A NV60 build in its name like: dd-wrt.v24-18777_NEWD-2_K2.6_big-'''nv60'''.bin | ||
* Recovery from a firmware with the wrong nvram size requires use of a jtag cable to erase the nvram.<sup>1</sup> | * Recovery from a firmware with the wrong nvram size requires use of a jtag cable to erase the nvram.<sup>1</sup> |
Revision as of 17:53, 1 April 2012
Contents |
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 |
Switch | 4x GigE + 1 WAN Broadcom 53115 IEEE 802.3/3u/3ab |
USB | 1x USB 2.0 |
Radio wl0 is Broadcom 4718 (SoC)
Radio wl1 is Broadcom 4331 Intensi-fi Single-Chip 802.11n Transceiver
Flashing
Warnings
- The E4200 is very sensitive to the nvram size.
- For the initial flash, upgrading stock firmware to DD_WRT use Flashing process procedure below!! Please follow it to to prevent a brick only use trailed builds
- A trailed build has "E4200" in its name like: dd-wrt.v24-18777_NEWD-2_K2.6_mini-e4200.bin
- The only safe builds which can be used AFTER initial flash for this router are nv60 builds
- A NV60 build in its name like: dd-wrt.v24-18777_NEWD-2_K2.6_big-nv60.bin
- Recovery from a firmware with the wrong nvram size requires use of a jtag cable to erase the nvram.1
- Support for the E4200 is still very much a work in progress at this time, outstanding issues reported have included WAN stability, and both 2.4GHz and 5GHz Radio stability.
Flashing Process
- Perform these steps when flashing from the stock Linksys GUI:
- Read all required reading sections of the peacock announcement: http://www.dd-wrt.com/phpBB2/viewtopic.php?t=51486
- Disconnect all cables and wireless clients.
- Do a Hard reset or 30/30/30 on router.
- Set your computer to a static IP-address 192.168.1.8
- Connect 1 Lan cable to pc doing the flash.
- Flash the latest E4200 specific mini build E4200 Trailed Initial Flash Build
- Do NOT use a build with "nv60k" in the name for the initial flash, use only the build linked just above.
- Wait for the flashing process to complete.
- Wait at LEAST another 5 minutes after the flashing process has completed.
- Perform a Hard reset or 30/30/30 after the device has successfully updated.
- Wait 3 minutes and log into web interface.
- You may have to clear your browser cache before the web login will display.
Upgrading Process
- If you need to upgrade to a build other then mini or a newer release take note of the following
- If a nv60 build is flashed to the router those are the only builds which can be flashed from that point on.
WARNING AFTER installing DD_WRT, ONLY flash -nv60k builds,
Flashing anything else to the router will brick it as noted above
- Select the build of your choosing (Mega, Big, std_usb_nas, OpenVPN, VoIP.)
- Follow the same flashing procedure as you used for the initial flash
Reverting back to stock firmware
- You can always revert back to stock firmware.
- Download the latest E4200 firmware from linksys site.
- 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.
Wireless-N Configuration
- As is explained in http://www.dd-wrt.com/wiki/index.php/Wireless-N_Configuration make sure that you use AES 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.
- Both the 2.4 and 5GHz Radios run at a stock transmitting power of 100mW, decreasing the transmitting power to a value between 40 & 50mW has seemed to help stability.
References
- e4200 build thread at dd-wrt forum
- FCC disclosures