For those who has tried to flash RT-N13U with OpenWRT, I have some questions :

1. Based on what KLseet's instructions, HERE's the page in which he was based on.  Being a new comer in this flashing router with open firmware business, which of the files do I need to download to upgrade the firmware ?  I tried to upgrade firmware with openwrt-ramips-rt305x-rt-n13u-squashfs-sysupgrade.bin  --> but it fails to even upload to the router.

2. Do I need to upgrade some OpenWRT root file to router before upgrading it with the sysupgrade file above ?

Sorry for stupid questions.

Thank you for the reply.

After carefully read the instruction, and since his instruction to 'upgrade' the firmware is from the TP-link model, I would have thought that he suggested to flash with original firmware first with the Asus firmware restoration utility, and subsequently 'upgrade' the firmware with the above mentioned OpenWRT firmware from the Asus webUI page (under administration firmware upgrade option).

I will try to install the firmware again with the utility later and let you know the outcome.

    Wait for at least 2 mins for the whole process to complete
    After flashing, there is no webgui to access since the trunk build does not comes with any webgui

Launch PuTTY, choose Telnet mode to login to the device

managed to use Putty to go into openWRT now !!

Now I am stuck at connecting Lan link to Wan of the router to get internet access.  How to do that ? 

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I managed to head to my office to use their LAN line for the next step.

By now, I finally managed to set most of the stuff up with OpenWRT, with fast downloading speed etc.  Just that despite the proper set up, I still cannot make the IPTV works.