Hi,
I have been looking to flash OpenWrt on my Linksys X3500, but couldn't find any mention of it (either on the OpenWrt website or the web), although there are lots of information for the EAxxxx line which I assume is not too dissimilar.
I am a bit lost about how to proceed: is there some way to flash one of the existing firmwares? or modify and recompile one without needing to open the router and tinker with the serial connection? I have little experience tinkering with the hardware, and would rather not risk bricking this toy and cut my family off the internet 
Here is some information about the hardware, in case someone can help me in figuring out the parameters I need to pay attention to when considering a firmware:
---- System Info ----
system type : CiscoX3500
processor : 0
cpu model : Broadcom4350 V7.0
BogoMIPS : 399.36
wait instruction : yes
microsecond timers : yes
tlb_entries : 32
extra interrupt vector : no
hardware watchpoint : no
ASEs implemented :
shadow register sets : 1
core : 0
VCED exceptions : not available
VCEI exceptions : not available
unaligned exceptions : 13
processor : 1
cpu model : Broadcom4350 V7.0
BogoMIPS : 402.43
wait instruction : yes
microsecond timers : yes
tlb_entries : 32
extra interrupt vector : no
hardware watchpoint : no
ASEs implemented :
shadow register sets : 1
core : 0
VCED exceptions : not available
VCEI exceptions : not available
unaligned exceptions : 13
Number of processes: 64
12:00am up 0 min,
load average: 1 min:1.47, 5 min:0.32, 15 min:0.10
total used free shared buffers
Mem: 124368 71640 52728 0 4200
Swap: 0 0 0
Total: 124368 71640 52728
------- SW version -------
FW_X3500_AnnexA_1.0.01.002
A2pD035m.d24c
12F10704401181
------- HW version -------
1.0
A2pD035m.d24c
BoardId=LinksysX3500Thanks!