Thank you. I did that but it does not work.
I did take apart as I had no choice. It seems there is no contact you are tight but I spent 2 hours doing all sorts of things but the battery compartment is very weird and difficult. Doesn't line up properly

Does the remote’s LED light green?
Else, orange, red or blue, read manual page 18 for how to set it.

And of course it’s covered by your country’s usual warranty.

Ok...I managed to fix it!! I took your advice and cleaned the contact and then slightly bent them enough to make it touch properly.
Thank you everyone but to be honest, the remote does NOT reflect the rest of the unit adequately. Hopefully this will be slightly upgraded to have a better contact.
Cheers

Yeah I have a hard head. Spent the majority of the afternoon changing a battery haha!!

Why shouldn’t it?
This is something with your dealer trying to cop out of responsibility.
Report to RME!

ADI´s remote is in my opinion too not so good.

It has audiophile nervosis -generating EQ, B/T, Loudness and Balance -buttons waiting for accidential presses (and can´t be disabled), its transmit power is mediocre at best, and its general key feel is somewhat crappy.
It uses some rare (NEC?) IR-protocol which some universal remotes may have difficulties to learn. At least my old universal had, it didn´t get ADI´s power command in any way.

Fortunately replacing universal remote to another model worked well, an now ADI is finally under good remote control. I ended up to this model, it learned ADI´s commands, even that power command, without problems 

https://www.amazon.de/-/en/One-Contour- … 1&th=1

Needless to say, I didn´t teach EQ, B/T, Loudness and Balance -buttons.. Transmit power and key feel is excellent, and ADI responds now in lightning manner.

With this improved remote, general "ADI-usage-experience -index" is now clearly better. Recommend same procedure for everybody having remote issues.

I also had some problems with IR after some months, already discussed here, bad contact on volume keys
.
I replaced it with some programmable universal remote and programmed it and now it is much better than original one. You can program much more functions for you DAC then original one, there is doc with functional codes https://www.rme-audio.de/downloads/adi2 … mmands.zip . You can switch even different setups and filters for immediate comparing.
And reliability is also better. I don't use original IR anymore.

See this list of programmable functions:

Remote keys
Power On
Power Off
Volume -
Volume +
COAX
OPT
USB
1
2
3
4
Mute

Additional Functions for Programmable Remotes
B/T
EQ
LD
VOL
B+
B-
T+
T-
BAL L
BAL R

Setup 1
Setup 2
Setup 3
Setup 4
Setup 5
Setup 6
Setup 7
Setup 8
Setup 9

Mono
Mono to L
Mute all
EQ+B/T+LD
Toggle Ph/Line
Polarity
AutoDark
Dim
Toggle View

Crossfeed 1
Crossfeed 2
Crossfeed 3
Crossfeed 4
Crossfeed 5
DAC SD Sharp
DAC SD Slow
DAC Sharp
DAC Slow
DAC NOS

The Remote that is supplied with the ADI-2/4 Pro SE does feel sturdy, even has some weight.

Works nice so far.

Maybe so, it´s typical "TV-remote" -sized, and looks cheap because it IS cheap.
Quite a bargain in my opinion though, I couldn´t believe how good remote controller one can get with 11 €. 8 devices, fully teachable universal remote, with good remote controller general-properties. Using ADI with this new remote is more enjoyable now.

Of course actual main reason to switch universal remote is ability to use multiple devices with the same remote, which I also happened to need.

UPDATE!!
The dealer has sent out a new one for me and I return the original. The original person I talked to was in error about it not being under warranty. It works but still intermittent and it's annoying.
I would like to eventually get an aftermarket one but I would probably lose some functions. Unless someone knows otherwise.

I did not noticed that you have bad link on page https://rme-audio.com/adi-2-dac.html tab Downloads, part Additional downloads, IR commands.
Here you have link http://rme-audio.de/downloads/adi2pro_ir_commands.zip
The same link is on ADI2 Pro page.
So it should be corrected.

I have changed my original post.

I too bought one of these for my ADI2-DAC FS and am really pleased with it. I bought the 4-device version for only £9 in the UK. Currently <£8 - remarkable value for money:

https://www.amazon.co.uk/dp/B077J5YXNH/ … 81_TE_item

It's functionally excellent - ability to learn, ease of use, range, simplicity of batteries. Buttons' tactility is good-enough.

I was fortunate-enough to buy a second-hand Logitech Harmony 300 so that I could get the full set of RME commands. I used the  Logitech to programme the One-For-All - we are fortunate that Logitech's programming software is still available and still works nowadays.

So, I've spent an extra £30 and gone to a load of trouble but now have a good solution to remote-control of my RME.

These remotes like a hard reset every so often. Take the battery out wait a minute, put it back in. If the battery measures 3 volts or above it should work fine.

I have an ADI-2 DAC FS which is working great for 13 months - have even recommended it as an ideal DAC for a regular Hi-Fi setup. However, I cannot say the same about the Remote and the Support that I received. The Remote kept on flashing Green about a week back - and refused to activate any function on the unit. In fact the only function that worked (irrationally) is the Treble change on Line Out which was on active window. I checked in the various forums, and users say this is the death knell for the remote! I changed the battery, but no point.

Sent an email support request to RME - who just sent me their India Dealer's name - who I redirected the support request to - and of course they did not even bother to respond. VERY POOR QUALITY OF SUPPORT RESPONSE. I am not planning to buy another remote as its not very useful and the on-unit controls work very well. But RME is only diluting their brand by using the cheapest remote in the OEM market while promoting a premium engineering product!