well I guess it actually worked, maybe not for you? Maybe you hit the issues using the wrong instructions?
Discussed here
To be honest, I think fairphone really messed up with their fingerprint sensor issue.
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The upgrade to android 13 comes with absolutely no warning or whatsoever
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The provided workaround is only manageable by technically capable people and still then the correct links are not available.
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Providing only android 11 and stopping support for that early 2024 is not really a solution.
I chose this handset because it came with the promise of at least 4 years support, so far the hardware experience was not very good (slow processor, bad camera) and the promise of 4 years support was not kept. I liked the idea of the repairability of the FP, but what is it worth if this brick goes to e-waste after barely 3 years?
Turns out the file is here
Stupid that the link is nowhere on the support page, and nobody on this forum is capable of providing the link.
nice way to say thanks (to other user!) for trying to help!
And where is this coming from? what is digitalocenaspaces? that does not seem to be anything official?
As Google directly leads to pishing when searching for this, I will remove the link till you confirm.
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Well I was hoping for someone from the fairphone support to answer, but it has been silent here for some weeks. The file name provided by a user was useful, but then the answer to use the reinstall file was not so useful. The link is the one from the official support article, but with the file name provided by a user here. It should have been on the support article including all previous versions, but only one is given.
Fairphone service is far below my expectations
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The forum is no official support channel.
You’ll find this on every page you open in this forum…:
Look Yvonne, I get it, you are a Fairphone Angel and you love Fairphone. I also like the concept and obviously I have also supported the company by buying a new FP3+.
However, saying something like “maybe not for you”, when FAIRPHONE has removed the file to update from 23 to 25 from EXACTLY the article that you just linked, just shows that you really have no idea of what we are talking about here at all. The file I used (and still have saved) is no longer available to download, and here comes my “maybe”: maybe because it DID NOT work? What is available now (and what you linked) is an update from 25 to 26 which is USELESS for people stuck on 23. We cannot just magically jump to Version 25 and then use the currently provided file without wiping all of our data.
And just to point out another thing which should be obvious: I followed that guide to the letter and I am not new to flashing android devices. The process with Fairphone is actually very straightforward compared to other devices and the guides provided are clear and simple. The issue is not somehow “me”, but that the file from Fairphone (which they have now removed themselves, I can’t stress this enough) was simply rejected by Fairphones own verification process on the Phone. You can see photos of this in my original post on this matter:
So to clear up your obvious confusion: OP is asking where the file is that he NEEDS to be able to do an OTA-sideload update as described in the guide. The guide mysteriously no longer contains said file, probably because of an issue with the update. This issue was described by me in a previous post. The only option OP has without said file is to use the “flashing with fastboot” option and wipe all his data.
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Well as you think, however please stay friendly and respect forum rules. And when you look at what I linked you see people did succesfully upgrade to 025.
And you might probably re-read what I wrote above
OK. So, here are the files:
These are the OTA files that can be manually sideloaded from recovery using adb.
Thanks.
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Thanks. That is the same link I figured out after 3 weeks of puzzling it out with a silent forum, and then posted myself. That link was then removed by FP angel Yvonne and luckily now finally reported back by TeamB58.
I would like to see this linked (and earlier versions) in the official support article as well, for others may struggle with the same issues.
Can anyone confirm that when I use this sideload from 0023 to 0025 it will not actually brick my phone?
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I explained you why and you didnt answer my question and accusing the forum=user again for being silent…
No one will confirm such, as again, we are user, no staff.
Well, sorry for that I was not intending to target any particular user, just the lack of support in general. I was very frustrated by the lack of support from Fairphone, and I was assuming that the company had a few staff (marked as Angels) around on this forum. Apparently that is not the case.
Anyway I have finally succeeded updating to 0025 and then to 0026 with the files linked by @TeamB58
Thanks.
So you simply used the method described under OTA Sideload in the support article you linked in your OP, step by step, twice (once for each file) and it all worked fine w/o data loss, correct ?
Yes, just followed the guide twice, no data loss.
I had to press another time the volume up + power button in the bootloader to reach the menu, as in the description but apart from that everything went as described.
I am using Linux, so I had to install ADB manually. For Win and Mac I believe ADB is in the zip file.
Just to update you all, 4.A.0027.1 is released and support page is now updated. A full OTA file is also now available that can be used to sideload from any previous Android 11 version.
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Cool…
waiting for someone to report success or failure before I attempt on my wife’s and my own devices 
… you never know 
I attempted the Sideload process.
There must be a problem with the content of the sideload_update batch file on Windows:
This bat file says "start bin-msys\git-bash.exe -c “./sideload_update.command”
but in .\bin-msys, there is no git-bash.exe file, but there’s a PortableGit-2.35.1.2-32-bit.7z file.
Can someone please clarify what I should do before attempting something I may regret ?
Should I simply extract in place the 7z file with all its content and subdirectories ???
Oher gotchas or misplaced files I should know before proceeding on Windows ?
a little confirmation would be appreciated 
Not sure, I was using Linux. But you could install ADB (Android development tools) and simply use that.