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 | + | * For the initial flash, upgrading stock firmware to DD_WRT, use Flashing process procedure below! Please follow it. To prevent a brick use only 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''' | + | * The only safe builds which can be used '''AFTER''' initial flash for this router are '''nv60 builds'''. |
- | ** | + | ** NV60 build has a 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> | ||
- | + | * <span style="text-decoration: line-through">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.</span> The E4200 works very well with '''Kong 22000++''' (see below). | |
- | * 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. | + | * 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. |
=== Flashing Process === | === Flashing Process === | ||
- | + | Perform these steps for initial DD-WRT flash from the stock Linksys GUI: | |
- | # Read all required reading sections of the | + | # Read all required reading sections of the [http://www.dd-wrt.com/phpBB2/viewtopic.php?t=51486 peacock announcement]. |
- | # Disconnect | + | # Disconnect any Ethernet cables from router and PC, and disable PC wireless. |
- | # Do a [[Hard reset or 30/30/30]] | + | # Do a [[Hard reset or 30/30/30]] of 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. | |
- | # Flash | + | # Open router GUI (192.168.1.1) in Web browser on PC. |
- | #* <font color=red>'''Do NOT use a build with "nv60k" in the name for the initial flash'''</font> | + | # Flash an E4200-specific mini build; e.g., [ftp://ftp.dd-wrt.com/betas/2013/05-27-2013-r21676/broadcom_K26/dd-wrt.v24-21676_NEWD-2_K2.6_mini-e4200.bin '''21676 trailed initial flash build for E4200'''] |
- | # | + | #* <font color=red>'''Do NOT use a build with "nv60k" in the name for the initial flash'''</font>; use only the trialed build linked just above. |
- | # Wait | + | #* '''21676 is a stable, reliable, recommended build for the E4200''', but ''only use the mini version'', since ''larger versions have the [http://www.dd-wrt.com/site/content/heartbleed-dd-wrtdd-wrt-online-services dangerous Heartbleed vulnerability]''. If you need more functionality than mini, upgrade to '''[http://www.desipro.de/ddwrt-ren/K26/r22000++/kingkong-nv60k-broadcom.bin Kong 22000++]''': |
+ | # Wait for flashing process to complete, ''then wait 3 more minutes''. | ||
# Perform a [[Hard reset or 30/30/30]] after the device has successfully updated. | # Perform a [[Hard reset or 30/30/30]] after the device has successfully updated. | ||
- | # Wait | + | # Wait for router to boot up, then log into DD-WRT Web interface (192.168.1.1). |
- | #* You may have to clear your browser cache before the | + | #* You may have to clear your browser cache before the Web login will display. |
=== Upgrading Process === | === Upgrading Process === | ||
- | * If you need to upgrade to a build other then mini or a newer release take note of the following | + | * 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.<br><font color=red>'''WARNING AFTER installing DD_WRT, ONLY flash -nv60k builds, <br>Flashing anything else to the router will brick it as noted above'''</font> | * If a nv60 build is flashed to the router those are the only builds which can be flashed from that point on.<br><font color=red>'''WARNING AFTER installing DD_WRT, ONLY flash -nv60k builds, <br>Flashing anything else to the router will brick it as noted above'''</font> | ||
- | # Select the build of your choosing (Mega, Big, std_usb_nas, OpenVPN, VoIP | + | # Select the build of your choosing (Mega, Big, std_usb_nas, OpenVPN, VoIP).<br />The E4200 works very well with '''[http://www.desipro.de/ddwrt-ren/K26/r22000++/kingkong-nv60k-broadcom.bin Kong 22000++]'''. |
# Follow the same flashing procedure as you used for the initial flash | # Follow the same flashing procedure as you used for the initial flash | ||
Line 92: | Line 93: | ||
= Wireless-N Configuration = | = Wireless-N Configuration = | ||
- | * As is explained in [http://www.dd-wrt.com/wiki/index.php/Wireless-N_Configuration ''' | + | * As is explained in [http://www.dd-wrt.com/wiki/index.php/Wireless-N_Configuration '''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 | + | * 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. |
= References = | = References = |
Revision as of 14:37, 22 May 2015
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 prevent a brick use only 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.
- NV60 build has a 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. The E4200 works very well with Kong 22000++ (see below).
- 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.
Flashing Process
Perform these steps for initial DD-WRT flash from the stock Linksys GUI:
- Read all required reading sections of the peacock announcement.
- Disconnect any Ethernet cables from router and PC, and disable PC wireless.
- Do a Hard reset or 30/30/30 of 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 build with "nv60k" in the name for the initial flash; use only the trialed build linked just above.
- 21676 is a stable, reliable, 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 Kong 22000++:
- Wait for flashing process to complete, then wait 3 more minutes.
- Perform a Hard reset or 30/30/30 after the device has successfully updated.
- Wait for router to boot up, then log into DD-WRT Web interface (192.168.1.1).
- 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).
The E4200 works very well with Kong 22000++. - 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 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.
References
- e4200 build thread at dd-wrt forum
- FCC disclosures