Well, my guinea pig, you gonna be my test subject.

Of course there are other settings you need to do.

Please follow the instruction at page 96 and 97

[attachmentid=9907635]
EDIT:
There is hidden 5Ghz WDS page too, did you test with 2.4ghz? 
EDIT2:
Hmm...there is "wds_mode" hidden as well.

I am not sure what these modes might do.
Assuming if it works....then :

But the feedback from few users said only EU firmware has hidden WDS functionality.
If you are using Malaysian firmware, you are outta luck.

....sigh...CTRL + F  to search

Here is video
wds.mkv

anyone know how to set the TIME flashed AC1200 into wireless bridge mode?

It works as repeater if i cucuk lan cable from my other router into this ac1200. But i dont want the AC1200 to have LAN cable, i want it to be bridge wirelessly.

Anyone?

Already done.

Flashed the time modem to eu firmware and use inspect element to evoke the hidden wds page. Linked the router with my main rputer via 2.4ghz wds. Somehow this c1200 cannot detect my 5ghz main router set using 802.11ac mode only.

Everything working fine now. Can get dhcp from main router. Just cannot wds using 5ghz unless i set my main to 802.11b/g/n/ac mode. Which i dont want cox i wan the main router to run full AC at 5ghz.

That is quite true

Currently using Asus RT-AC55UHP (Qualcomm Atheros chipset) as base station, try to WDS to the AC1200 but doesn't seem to work

Things that I've done:
LAN address - Asus is 192.168.1.1, set TP-Link to 192.168.1.2
Set WDS on 5GHz, connect to Asus' SSID
Set to same 5GHz channel on both Asus and TP-Link
Set to same SSID
Disabled DHCP on TP-Link

But unable to connect to TP-link directly

What else can I try? Should i try different SSID?
I am able to access the setup page for TP-Link even though I'm connected to Asus though

Thanks for the advice. Will give it a try later.
With more tinkering last night, I've managed to connect to the TP-Link router via 2.4GHz network (with 5 GHz as the WDS backbone) and manage to access the internet so I can safely assume that WDS is working already.

Just need to confirm, when using 5GHz as the backbone for WDS, I can only connect to the 2.4GHz network on the TP Link? Attempting to connect to the 5GHz doesn't seem to work.

Btw, I've also noticed a bug where SSID is not hidden even though the Hide SSID box has been ticked. Planning to hide the 5GHz network which is used as the backbone.

When using 5GHz as backbone, my devices were not able to connect to the 5GHz network.
On the other hand 2.4GHz works without issue. This is also why i wanted to hide the 5GHz SSID since it wasn't working for me.

Either way, I've decided to discontinue the "project" since I'm not getting much gain with the set up but it was a good learning experience. The reason I started it because I wanted to have better internet connection in areas where the main router is not in line of sight. At the moment, I'm only able to get the full 300 Mbps unifi turbo speed if i'm near the main router (Asus RT-AC55UHP).

Meanwhile, I'm exploring other options to obtain better speed such as upgrading my main router (eyeing Asus RT-AC86U or RT-AC88U) or adding mesh to my home network as WDS is relatively unstable.

Just got my WDS working on 5G by following the guide here, thanks a lot! Is there any way to enable both 2.4G and 5G WDS with the EU firmware?

A follow up question on WDS. My PC is connected to the 2nd router's (TP-Link AC1200 from TM as repeater) 5Ghz connection, but from time to time I would find the wifi status showing "No Internet Access". When that happens I found the PC is being assigned a random IP address (i.e. 169.x.x.x.) rather than the normal internal subnet range (192.168.1.x) which should be assigned by the main router, as the 2nd router's DHCP is set to off. A reboot of the router would solve the problem and my PC would be given the correct IP Address.

What could be the reason and what have I missed from the WDS configuration?

I followed the WDS setup guide provided here at page29/30, the only part I didn't perform is the modified config.bin so the channel is assigned automatically but seems to stay on channel 36 so far, I've also fixed my main router to channel 36 for 5Ghz. Using 5Ghz from the main router as backbone, main router is (TP-Link Archer C5v ac1200 router) provided by Maxis.

The 802.11k on this unit confirmed works, next thing I wanna do is get 2 more units of this and connect them with LAN cable since it so cheap in 2nd hand, about RM100 can get. So that with RM200 I can have 3 APs with roaming features, each AP I can runs about 480mbps with my XS Max, killer C/P rate

So far no, maybe I use it as AP not router, and maybe due to I changed the power adapter to higher grade to match the higher txpower output , US version original come with 12v/2a vs MY version 12v/1a

Yes I’m using 180123 firmware, how to check the WDS?
As for power adaptor, it’s totally safe to use higher Amp as long as the voltage is same, the device will only draw as much power as it needs, it’s more like 3A = “up to 3A” and 1A =“up to 1A”. But voltage is the one we need to be careful, higher voltage will burn ur device

Page 29. From top to bottom.

-.- US firmware = different hardware --> Cannot flash EU hardware with US firmware.

Actually you can, just flash the beta firmware on the 1st page of this tread, then flash to US firmware, no problem.

Benefit:
Stronger 5G, really strong in low channels (36-48)
802.11k supported, so you can add it as an AP(LAN) with any router, you will get seamless roaming
Beamforming available

Bad:
Weak 2.4G
No way back to EU or MY firmware (I'm not figure it out yet, maybe someone have better idea)
No WDS

So, if you plan to use it as an pure 5G AP and you have a LAN connection, this firmware is made for you, otherwise, stay in EU.

PS. Change a better power supply for maximize stability, US version uses 12v/2a vs MY/EU 12v/1a, just get a 12v power supply with 2a or more, I got it from Sri Computer Lowyat for about RM20+

PPS. Those are just my personal experience, try at your own risk! I've never use it as router, not sure how it works, but as an AP, uptime is about 9 days before I removed it for another AP testing, no hangs no lag no problem, I'm thinking if I plan to use it for a long period, I will get another one of it and connect them behind my OpenWRT router, 5G Wi-Fi cover my whole house area with 450mbps~510mbps, by spending RM160(RM60 for WR1200JS OpenWRT router and RM100 for another C1200 in 2nd hand market, 1st C1200 is free by TM), I just can't seems to find a better C/P rate option, no one even near

Should I flash to EU firmware better or US? Thanks

Which US firmware? This one? https://www.tp-link.com/us/support/download...00/v1/#Firmware

I am using different method to set the wifi country code for EU firmware via config.bin method. It works. 
I leave the EU firmware default country code for 2.4ghz wifi while editing the 5.0ghz country code to US. The best of both world. Impressively, there is really an increase in 5.0ghz signal strength dbm.    Not sure if the increase is caused by beamforming functionality.

https://forum.openwrt.org/t/build-for-tp-li...200-ac1200/2547
A very......very long instruction........
Then I gonna add it into first post.......

which fw version you are using?
20180123 or 20180103?

Do I need to change the adapter still? If I disabled the 2.4G, still need 2A adapter?

So firstly I will need to flash to the EU firmware (already did), after that flash to US firmware and the repeat the same process for WDS. Am I right?