You can always revert back to stock firmware. Follow the same flashing procedure as you used for the initial flash.K3X mega is the recommended build version for this router, and supports SFE accelerated NAT after build 33006. After the initial flash of a K26 build, you can upgrade to K26 mega build or K3X mega (broadcom_K3X folder).Select the build of your choosing from the the following link: Where do I download firmware?.WARNING: Flashing anything else may result in a brick, as noted above To upgrade to other builds AFTER installing DD-WRT, ONLY flash nv60k (or trailed) builds.If the browser GUI login does not display, clear the browser cache.Wait for router to boot up, then log into DD-WRT Web interface (192.168.1.1).Reset the device after it has successfully updated.Wait for flashing process to complete, then wait 3 more minutes.If you need more functionality than mini, upgrade to a newer build, see Where do I download firmware? for links. 21676 is a stable, recommended build for the E4200, but only use the mini version, since larger versions have the dangerous Heartbleed vulnerability.Do NOT use a "nv60k" build for the initial flash only use a trailed build, such as above.Flash an E4200-specific mini build e.g., 21676 trailed initial flash build for E4200.Open router GUI (192.168.1.1) in Web browser on PC.Wait for router to boot up, and then for PC to get DHCP address from the router.Connect Ethernet cable from a LAN port (not the Internet port) of the router to PC doing the flash.Disconnect any Ethernet cables from router and PC, and disable PC wireless.Read all of the required Peacock announcement.To install DD-WRT, perform these steps from the stock Linksys GUI: Ensure adequate cooling or reduce transmit power to 40-50 mW.The E4200 dissipates a good deal of heat at the stock 100 mW transmit power.Read model-specific and New Build threads before flashing different firmware.The E4200 works very well with most newer builds >32XXX, see Where do I download firmware? for links.Recovery from firmware with the wrong nvram size requires use of a JTAG cable to erase the nvram.Newer K3X builds may not have a nv60k.bin build, in this case use the trailed build for upgrades.K3X is recommended once you are running dd-wrt - only use a trailed build to flash from K26 to K3X.AFTER initial flash, only use trailed OR nv60k builds - NOT nv64k nor generic builds.
Only use trailed builds (with E4200 in the file name) to avoid bricking. To upgrade stock firmware to DD-WRT, use the Flashing procedure below.The E4200 uses nv60k builds, do NOT flash nv64k nor generic builds.These instructions are for E4200 version 1 ONLY! Version 2 has a marvel chipset and is NOT supported Broadcom 4331 Intensi-fi Single-Chip 802.11n Transceiver
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