From DD-WRT Wiki
 Initial Flash Instructions
 Initial Flash Instructions
- READ the peacock announcement: http://www.dd-wrt.com/phpBB2/viewtopic.php?t=51486
- Download this file ftp://ftp.dd-wrt.com/others/eko/BrainSlayer-V24-preSP2/2010/12-24-10-r15962/broadcom_K26/dd-wrt.v24-15962_NEWD-2_K2.6_mini-WNR2000v2.chk Note that this is a K26 file and all flashes of this router will require a K26 build!
- Push the reset button on the back of the router for 1 minute and release it.
- Attach a cable to the router and disable any wireless on your computer. Make sure the cable goes from your computer Ethernet connection to a LAN port (Not WAN port) on your router.
- Wait until you have a connection with the router
- Login to the router at http://192.168.1.1/
- At the password prompt, put admin/admin or admin/password for the username/password
- Go to the Router Upgrade link on the left side of the router gui and click on it
- Navigate to and Choose the file that you downloaded, double checking that it is the mini-WNR2000v2.chk file and not some recipe your grandma sent you or some other router file
- When it asks you if you want to upgrade to a different version, click on yes.
- Wait FIVE full earth minutes after the upgrade appears to have finished. You can watch the lights on the front if you need something to do. As long as they are changing, you need to sit quietly and wait! If you screw this up you WILL brick your router. When the green light and the blue light and the port light that you are plugged into have all stopped blinking, you should be all right as long as you have waited FIVE FULL MINUTES!
- Log onto the router at http://192.168.1.1/
- Change your username and password to something you will remember by TYPING in the boxes and hitting enter.
- Do a proper HARD RESET on your router as outlined in note 1 of the peacock announcement. THIS STEP IS IMPORTANT!
- Repeat steps 12 and 13 and go in and configure your router. Hit save as you make your configurations before you switch to another tab, and when you are done, hit APPLY.
 Upgrading to Later Builds
 History dated 2013/11/07
Unfortunately, the WNR2000v2 is limited in its flash size to 3392 KB (or 3,473,408 bytes). http://www.dd-wrt.com/phpBB2/viewtopic.php?t=72269&postdays=0&postorder=asc&start=165
This limits the builds that can be used on this unit, INCLUDING the trailed builds. PLEASE NOTE that the last Brainslayer MINI build that will not brick this router is 18777 and the last OpenVPN-SMALL build is 18688. Uploading any build that is larger than 3392 KB will brick this router.
 Update dated 2015/03/25
It has been reported that the latest current build (26490) was able to be flashed on this device. That indicates that some of the size restrictions reported in the 2013/11/07 section above may not be accurate. See details on forum HERE, and/or flash chip size limitations as detailed in Note 4 of the peacock thread.
Note: From a 64 bit windows 7 box IE 11 did not want update firmware or apply settings on certain pages. Had more success using Firefox to upgrade/configure.
 Update 2016/05/11
Successfully upgraded to: dd-wrt.v24-29621_NEWD-2_K2.6_mini.bin
 Known Bugs/Issues
WNR2000v2 has a known bug with firmware 18777 and below (& 26490): LAN1, LAN2, LAN3 and LAN4 port work properly under 10M/100M half/full duplex, but the LED display are incorrect: LAN1 and LAN2 always amber; LAN 3 always green; LAN4 LED is correct, it will display amber for 10M connection and green for 100M networking.
 Bad Flash Recovery
A brick from flashing too large an image can be recovered via a pin-short to enter TFTP mode as described in this thread http://www.dd-wrt.com/phpBB2/viewtopic.php?t=81013 . Timing is very important for the short, please read the entire thread for instructions. This is not without risk!