would someone help me to choose the right version of OpenWrt ??

I've got TD-W8961ND v1 with the following specification

RAS version: 1.0.0 Build 100722 Rel.05210
System   ID: $2.12.15.0(QRE9.C39)3.11.2.175| 2010/07/20   20100720_V004  [Jul 20 2010 14:33:11]
romRasSize: 1645796
system up time:     0:05:42 (85f8 ticks)
bootbase version: VTC_SPI1.10 | 2010/06/23

cpu1: TrendChip TC3162LE-LQ128G
cpu2: TrendChip TC3086-QFN64-EPG

I really don't know which version to use and if OpenWrt is not available would you tell me how can I build for my device??

I do not think it can be supported...

Probably only 16M ram..

Another here, just a piece of crap:

Bootbase Version: VTC_SPI1.22 |  2012/4/12 16:30:00
RAM: Size = 8192 Kbytes
Found SPI Flash 2MiB Winbond W25Q16 at 0xbfc00000
SPI Flash Quad Enable
Turn off Quad Mode

RAS Version: Build 140305 Rel.04531
System   ID: $2.12.158.0(G04.BZ.4)3.20.17.0| 2014/02/24   20140224_v013  | 2014/02/24

Press any key to enter debug mode within 3 seconds.
.....................................
Copyright (c) 2001 - 2006 TP-LINK TECHNOLOGIES CO., LTD
initialize ch = 0, TC2105MJ, ethernet address: e8:94:f6:5b:ab:bc
initialize ch = 1, ethernet address: e8:94:f6:5b:ab:bc
Wan Channel init ........ done
Reset dmt
Check DMT version =b2 ........
Initializing ADSL F/W ........ done
ADSL HW version: b2, HCLK 140
ok

==>natTableMemoryInit
<==natTableMemoryInitANNEXAIJLM