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This issue is driving me crazy. My Code 50 used to work with my iphone and ipad, now it refuses to connect and I always get the above message.

I have performed the following:

1. Forgot bluetooth connection on both devices

2. Deleted iphone app and re-installed.

3. Re-paired and tried to connect with same issues,

4. Formed factor preset of amp with no luck.

I know the blueotth connects as I can play music through my amp from phone, I just cannot connect to update any presets.

Any solutions would be greatfully received, am getting so frustrated with this product.

asked 27 Mar 2022 at 11:37 AM

Geoff Ward






I have had a chance to spend a few days with the Marshall code 25 and I would like to share with you a few of my findings. I have played guitar professionally for over 30 years and have had all makes and models of guitars and amps in my time, but in general I would have killed for the equipment available to guitarist today.

This is the point where I look at the Code 25 and think “that looks like fun”. I have a few amps kicking about already, mostly gigging volume amps but I also have a Blackstar ID-Core 40, so this would be in reality what I would compare the Code 25 against.

Firstly my experience with the amp and a look around these forums makes one thing apparent. This amp is well named because it is a bit of an enigma.Out of the box I would consider the amplifier not fit for purpose this is really down to a few reasons.

Firstly, some of the presets are just absolutely terrible, I mean some of the worst patches I’ve ever heard on anything, “Small combo” and the “Brit” overdrive amps for instance are shockingly bad. You can make the excuse that all amp and effects units come with bad presets. However this is usually down to strange or weird effects to give bizarre sounds to show off effects but that nobody would ever use in a musical context. However some patches (such as Small Combo) are just basic amp modelling with no effects and are still absolutely terrible. Maybe these sound better on the 50 or 100, but if that’s the case remove them from the 25 it just gives a bad impression.

Secondly, the amp is stupidly loud. I don’t know if this is a marketing decision, but Marshall should look at its target demographic. This thing is a small bedroom practice amp, maybe at a push for some very small live situations, but that is it. Why make the thing so loud? If you need to use this amp near anything over half volume you have bought the wrong amp it’s as simple as that.

Thirdly, some of the modelling is not all it could be with digital artefacts (in the low end in particular), and a fizzy noise gate that for some reason is on patches where there is absolutely no need to have it as the patch is pretty quiet. Once again this is not a professional gigging or recording product and it should be judgged accordingly.

The last bad point I would say against this amp is the tuner, both onboard and on the app are two of the least responsive and wildly inaccurate tuners I have ever seen. Really not even close to tune! Put this down to another marketing tick box.


OK, now the good points.

It seems pretty well made and solid for what it is.

I like the size and weight, ideal for a bedroom practice amp.

I like the complete range of controls on the amp, and how you can do everything on the amp that you can do on the app, and it’s easy to do. Great user interface design work.

I like the Bluetooth features and the app. I know people have had problems with Bluetooth, but both my IOS and Android phones connected right away and are stable. I can stream music no problem from outside the house or in other rooms with no issues.

I like having 100 presets to store all the patches I could want (My Blackstar only had 6, and you can only have 1 for each model).

The headphone socket sounds OK, but if I wanted that as a primary feature I would have just bought headphone amp with effects.

I don’t use the recording over USB feature. If I did I wouldn’t expect something this cheap to be amazing. Once again if you want this you probably have bought the wrong product, and are in the wrong price bracket.

I like the cost, its amazing what it does for the money.

I like the sounds, now that I’ve got rid of the awful ones.

It looks pretty cool.

It’s a Marshall.


To make this amp useable, I basically had to do the following:

  1. Delete all those terrible patches that are just filler and basically just give the user a bad experience. After doing this I was left with around 20 good sounding patches and 20 OK patches, the other 60 I replaced with a patch called “Blank” (which I have put up on this site). That way every patch sound good to me.
  2. I turned the Mater volume up to ¼ (around 9 o’clock)  and went through the remaining patches adjusting the patch volume of each to make it a sensible volume for bedroom levels. This ranged from around 0.3 to 5 for most patches depending on the patch. This means that you have more control over the master volume and can change patches without is suddenly blowing you head off. There is still plent of volume in the amp after doing this. OK I admit if I want to use headphones I have to turn the master up around half way, but that’s no big deal. Likewise as I said I don’t use the USB for recording, but I assume I would have to turn up the volume for that too. I don’t see that as a problem either for a product in this price range.

Overall I like the amp and doing just these 2 thing make it much more of a pleasure to use. The volume level are more what they should be for a product of this type and I don’t ever hear any of the awful patches (there are plenty of good ones).

Maybe other people can share their first experiences or tips with the Code 25?

asked 02 Mar 2021 at 04:07 PM

Joliet Jake (85)






I just received a Marshall Code 25 as a gift and I am new to guitar playing and using an amp. So I have 2 questions actually.

1. In the User Presets section, what does the X over the amp (code not available) exactly mean?

2. I managed to connect the bluetooth on my iphone with the amp, and it works fine, but everytime I turn my amp and the app on my phone on, my amp doesn't show in the amp. So I end up having to sync the bluetooth every single time I turn it on, let it search for my amp, and then I can get started. Is there some reason why my amp doesn't stay in the app?

asked 12 Feb 2020 at 06:53 PM

Jose Roman






Hi I have a CODE 100H head/cab and a CODE 100 combo both with the latest firmware re-installed from Marshall and both have this issue, i.e. the amp very oftenn completely freezes when I save a preset.

Steps to reproduce:

- Modify any patch on the front panel

- Save

- 50% of the times the amp seems to freeze. The preset is saved but you can no longer change preset and there is no sound coming out.

The same happens if you modify a patch from the iOS app via bluetooth and then save it from there.


It's REALLY frustrating and I can't believe I didn't find anything on this forum under the "crash on save" keywords. Seeing it happens on both of my CODE units it much be a software bug, I don't think it has anything to do with my units.

Anyone else has seen this problem?



asked 23 Dec 2019 at 11:45 PM

Lele X (14)








Running V1.43 firmware.

I have followed all instructions and can not get the iPad 6 to connect in Gateway app.

It, however "pairs" just fine Bluetooth wise on the iPad 6! 

AND Gateway works well on my iPhone 5, switches presets and everything.

So I know I am doing this right and the Marshall code 100 Head is responding via Bluetooth (with my iPhone 5) but NOT with the iPad 6.


Edited: Its the damnedest thing. I removed and reinstalled the app on my iPad 6 at least 8 times with the same results.  


Then I reinstalled and paired the "9th" time, and it worked!!!!

I can turn the 100 Code head amp off, and back on and it still connects.


I'm glad it works now, but I dunno what I did differently.







edited 02 Jul 2019 at 06:24 PM

Michael Howell

asked 02 Jul 2019 at 04:17 PM

Michael Howell






I've owned the new Code 50 for only a few days so I'm still a novice navigating through all the features. I'm just getting into using the My Gateway app from my Iphone and noticed when I'm connected to the amp through Bluetooth and I have the "blue" presets showing on the app which are completely different than the presets I see on the amp when I'm not connected through the Gateway app. So for example when connected through bluetooth I see preset 00 as EL34 Heaven on both my phone and on my amp,  and when I'm not connected through bluetooth preset 00 is JTM Chill. I like the settings on the gateway app much better than what I have for presets when just using the amp without bluetooth. I guess what I'm trying to do is find the easiest way to say replace 00 JTM Chill with 00 EL34 Heaven so I can have 00 EL34 Heaven on the amp without having to connect using the gateway app? I've look at other questions and cant seem to find this answer. Is this the sync function?? Thanks in advance. 


asked 24 Feb 2019 at 04:49 AM

Ron DeMartino
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