No, it didn’t give me any problems.
OS Update: Analog Four/Analog Keys 1.55B
Hi, everyone. A little update for you. Analog Four/Analog Keys 1.55B is now available to download, adding some minor improvements and bug fixes. Please read the release notes for more details.
Download Analog Four MKII OS 1.55B here.
Download Analog Four MKI/Analog Keys OS 1.55B here
MOD EDIT : (Link for Mk1 FW)
https://www.elektron.se/wp-content/uploads/2026/06/Analog-Four_Analog-Keys_OS1.55B.zip
24 Likes
FYI
Improvements
The oscillator’s FIN parameter is now decoupled from the TUN parameter when snapping or reaching the knob’s end positions.
Bug fixes
Adding slew to the LFO’s random waveform did not work as intended.
Applying Control All to the LFO’s DST made the destination menu flicker and difficult to use.
Applying Control All to the arpeggiator’s parameters could sometimes incorrectly also affect the parameters on the OSC1 page.
Changing the active track while using the Control All functionality made it impossible to revert changes made to the first track – only the changes to the last active track could be reverted.
It was not possible to use Control All on the TRACK LEVEL parameter.
[MKII] Data Entry knob A was too sensitive when setting the number of pattern repeats on the Song Edit screen.
[MKII] When loading a project created in an earlier OS version, Quick performance assignments were not restored correctly
Some items in the Release Notes were missing (now added to 1.55, below)
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Sleeeeewwwwww! 
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Same here.
They messed up the URL, here it is edited: https://www.elektron.se/wp-content/uploads/2026/06/Analog-Four_Analog-Keys_OS1.55B.zip
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Added into source post thanks to @renderful
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The data entry knob fix is very much welcome, it was a bit fiddly to program pattern repeat.
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That bothered me, I’m glad it’s decoupled now.
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Hope you find 1.55B suits your needs then 
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Lovely 
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Aren’t Swedish people/Elektron suppose to be on vacations?
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Link is working now
https://www.elektron.se/support-downloads/analog-four-mkii#resources
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Trying to upgrade my keys.
Whilst the 1.55 update went well, 1.55B isn’t being recognised at all.
The OS Upgrade screen just sits there saying waiting for sysex.
Anyone else had a problem?
Double check you downloaded the correct version for the AK.
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I’ve heard some already are and most of the remaining folk will soon be away until some time in August iirc … so i think this is probably the last update for a while (the folk in that DT/DN ‘love’ topic had best pace their humour out for the long haul !)
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does make a lot of sense, especially with control all
I think it’s funny to see that dial can act as a turnaround when you reach -64/+63, which would basically mean a bipolar lfo could move the 6pm position between -/+
I think it’s a bug that it’s behaving like this? @ThomasJ
a really cute one is the automatic restart after installing the firmware
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Or just take a little summer break themselves, or am I saying a really weird thing now 
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