From DD-WRT Wiki
 Hardware Information
|CPU Speed||300 MHz|
|Flash ROM||16 MB|
|WLAN Max Speed||300 mbps|
|N MIMO Config||2 Transmit x 3 Receieve|
|Switch||4x 10/100 LAN + 1 10/100 WAN|
|USB Port||1 USB 2.0 Port|
 Flashing instructions for the E1550
After using the trailed build file for the initial flash (yes the file with the router name in it) only use nv60k builds to upgrade with or you will brick your unit!
- Read the Peacock Announcement carefully.
- Disconnect all cables and wireless clients.
- Do a 30/30/30 reset on router
- Connect 1 Lan cable to pc doing the flash.
- Log into Linkysys Web Interface Firmware Upgrade page at 192.168.1.1 and flash the firmware E1550 Trailed Initial Flash Build
- Wait 5 minutes to assure flash integrity.
- Power cycle by unplugging E1550 for 10 seconds.
- Plug the E1550 back in and wait about 2 minutes until it finishes booting.
- Do a 30/30/30 reset on router. Another power cycle after the hard reset is also recommended.
- Wait 3 minutes and log into web interface.
- You are done.
- After the initial flash - should you want to flash to a build with more features you can use a k2.6 nv60k BIG or mega build or any of the other build flavors that are of your liking for features. I linked the nv60k BIG build below to give USB support as the initial trailed mini does not.
 Build information
As noted in bold at the beginning of the flashing instructions, only use builds with nv60k in the name for upgrading - otherwise follow the initial flash instructions above if you are going from stock to dd-wrt, any other builds for upgrading an exsisting dd-wrt install without nv60k in the name will brick your router! This unit was supported with build 18946 or greater, this means you cannot use a build with a number lesser than 18946. For the safest results, use builds that are linked within this wiki as they have most likely been forum tested with ok reported results.
To find the latest builds, you can browse the DD-WRT file server and look for the broadcom_K26 folder, in there is the appropriate for your unit. Be aware that these are beta test builds and should be used with caution!
 Reverting to stock firmware
It has been asked about: "how do i revert back to stock firmware?" and the answer is download the stock firmware image from the manufacturer's website, reset the router back to defaults using a 30-30-30 hard reset, then flash the stock image from within the dd-wrt webgui. After 5 minutes it should finish, you will then need to do another 30-30-30 reset and then access the stock webgui @ 192.168.1.1