http://forum.tp-link.com/showthread.php?1608-Beta-firmware-Solved-TL-WR1043ND-hang-up-with-high-bandwith-and-WEB-interface-dies&region=china This post is collecting such cases. I think you should try...

Configure WDS on TL-WDR3600 for a try. Your device can be connected to 3600 either wired or wirelessly. This will be helpful. http://www.tp-link.com/en/article/?faqid=440

As I know, TL-WR1043ND has no SNMP function indeed.

ADSL light should be solid and it means it is synchronized. Otherwise, your internet will not be working properly even configured correctly. You may contact your ISP to confirm that phone line is...

Annoying comptible issue... Your 3G dongle is in compatibility list? Works with MR3420 V1 but V2? :confused:

Weird issue...like a incompatible issue. If possible, you may try to install it in a different PC. If it works with other PC except this, I'm afraid it is incompatible with your mainboard.