When you power the ADSL2MUE you have about 5 secs after the ADSL2MUE Ethernet light comes on to give the command from a dos cmd line ftp session
ftp> open 192.161.1.1
[Assuming that's the configured IP, if the config partition gets wiped the IP address defaults to 169.254.87.1 (and console serial port to 9600,N,8,1)]
which stops the autoboot process
username adam2
password adam2
A user called Mr Gamer has posted the original Linksys 4.12 firmware and bootloader on eSnips in a file 412_full.zip (Google it! to get to site then search for ADSL2MUE) (mtd0,1,2 seem identical to mine).
The instructions posted elsewhere on the net to manually upload the firmware are
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ftp> quote MEDIA FLSH
200 Media set to FLSH.
ftp> bin
200 Type set to I.
ftp> put fs412.img "fs mtd0"
...
ftp> put knl412.img "krn mtd1"
DO NOT ATTEMPT to ftp to mtd2 - the transfer will fail and will brick the router and require JTAG to repair (been there done that...)
Should your config get wiped then the following script which can be pasted into a HyperTerminal serial console session (with 10ms character delay) seems to restore the adam2/pspboot environment section of the 4.12 configuration
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setenv IPA 192.168.1.1
setenv MODETTY0 38400,n,8,1,hw
setenv MODETTY1 38400,n,8,1,hw
setenv MAC_PORT 0
setenv mtd0 0x900a0000,0x90400000
setenv mtd1 0x90020000,0x900a0000
setenv mtd2 0x90000000,0x90010000
setenv mtd3 0x90010000,0x90020000
setenv autoload 1
setenv BOOTCFG m:f:"mtd1"
setenv USB_VID 0x0451
setenv USB_PID 0x6060
setenv HWA_RNDIS 00:E0:A6:66:41:EB
setenv HWA_HRNDIS 00:E0:A6:66:41:E1
setenv usb_vid 0x13b1
setenv usb_pid 0x000f
setenv usb_prod Linksys RNDIS Network Adapter
setenv connection0 0
setenv HWA_0 00:12:17:xx.yy.zz
PS My ADSL Link still broken - so can't be 100% sure the modem still works, but it seems to!