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How to recover from a dead 5100/5200 modem
http://www.dslreports.com/forum/remark,11083613~mode=flat
This document applies to models E141 and E240, but should work for other models as well.
First of all, you will need to open your modem. There is one screw located under the label on the bottom of the unit, it is located about mid-center of the top of the label, between the Efficient logo and the word Speedstream. You can find it by applying slight pressure to the label around that location and see where the label starts to push in. Break through the label at this point to gain access to the screw. Once the screw is removed, you must unclip the top and bottom plastic housing of the modem. This can be a bit tough in some instances, but if you push in around the bottom half of the housing, while prying out the top half a bit, the housing should pop apart into two separate pieces. Try your best to work around the case from side to side until both halves are separated, and you have access to the board inside.
The second step, is to build the serial port that you will be connecting to the modem at location J5. This is the empty five hole connector you will see on the board. On both the 5100 and 5200 (models E141 and E240), J5 is located towards the back of the modem, semi-near the DSL/RJ11 port. Follow these links to see different methods of creating the serial port connector:
»Adding serial to SS 5200 or recovery alternative?
»www.compsys1.com/workbench/On_to···l#a232db
Once the serial port connector is wired to the modem, connect a serial/rs232 cable between the modem and PC. Open a terminal session of your choice (Hyperterm, Teraterm, etc.). Set the port to 115,200Bps, 8Bits, No parity, 1 stop, and No flow control. Then power up the modem. You should see the modem's POST messages appear on the screen. If not, check your serial connection to make sure it's wired properly.
At this point, the terminal screen will display one of two modes.
Mode 1) The terminal screen will display a Project X-MIPS logo and stop, prompting you to enter the modem's MAC Address. If this is the case, type in the MAC address of the modem (located on the label underneath) and press enter. Do not use dashes or colons in the address, just type all 12 characters in succession. Case does not matter. If you type a character it doesn't like, or too short of an address, you will get a parse error, and it will prompt you again. Be careful though, as you can actually give yourself a different MAC address than the one that was originally assigned to the modem.
If your modem's power light had been stuck on red, you will immediately see it change to green. The modem will run through it's boot process again, and will have loaded the modem's default configuration. This will put the modem into the state it was in when you first received it. At this point the modem is fully functional, and any firmware can be reloaded through the ethernet port as usual. You may disconnect your serial connection and screw the housing back together.
Mode 2) The The terminal screen will display a Project X-MIPS logo and reload in an endless loop. At this point, you will need to do something different. You will need to wait until you see this (or similar to):
Loader Starting...
FLASH: AMD Am29LV160B (Bottom Boot)
The display should stop at this point for a few moments, until looping through the post screens again. While the display is stopped at this point, start holding down a key until you start seeing boot> prompts. This may take a while, and the screen may loop a few times before you see this. If successful, you should see something resembling this:
boot> gotta 20
At this point, hold down the shift key and press the plus/equals key. This is important! If you do not do this step, the modem will not stop looping through the boot process. You will receive a message stating:
Whacking NVRAM...
Back at the boot> prompt, press the R key.
Follow the instructions for recovering from Mode 1 above.
Disclaimer: Efficient Networks/Siemens does not support this procedure. Please attempt this at your own risk. Be aware that if you attempt this, you will most likely void any warranty that you have on the modem.
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