Ok, thanks it was so easy.
Now C2 is updated to version 5.0.0.29. I succeeded. 
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For me the upgrade starts and when the progress bar is around 5% (don’t know exactly) It stops and says “Sailfish OS could not be updated. Please try again later.” and I can reboot.
Fortunately I can reboot into 5.0.0.21 so my C2 is still working but I don’t know what the exact problem is. I tried this 3 times, with the same result.
Just came on to say the same thing.
When downloading it hits 5%, then jumps to around 15%, then jumps all the way to 100%. Then, of course, only hits a few percent when installing and the ‘could not be updated’ message appears.
Tried downloading on Wifi and data, didn’t make a difference. I’ve tried around 10 times, thinking it could be iffy connection, but the download process always goes the same way. Nothing seems to make a difference.
Had the same problem. Delete Android app support and then try it.
Is it possible, however ? I really don’t understand where to look for it besides at GitHub - sailfishos-chum/sailfishos-chum-gui-installer: Installs the SailfishOS:Chum GUI application. But the installer is nowhere to be seen in the UI.
I don’t even want to know how you found that out. 
Unfortunately, it didn’t work for me either.
In the Jolla shop you just uninstall it. Reinstall is of course also possible
@matebovate @willmason5 In this case i would update from the commandline.
devel-su
ssu re 5.0.0.29
ssu ur
version --dup
Or use sfos-upgrade from the Openrepos
Just skip the installer and install directly from chum https://repo.sailfishos.org/obs/sailfishos:/chum/4.6_aarch64/aarch64/sailfishos-chum-gui-0.6.9-1.10.1.jolla.aarch64.rpm
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Tried it via the console. Then it was said that 560MB of space was missing
After a failed update you can inspect /var/log/zypp/history and it will tell you (sometimes) what failed.
I predict it will be something along the lines of:
# 2024-11-14 11:05:34 droid-system-s19mps-1.0.4-1.7.1.jolla.aarch64.rpm install failed
# rpm output:
# installing package droid-system-s19mps-1.0.4-1.7.1.jolla.aarch64 needs 717MB more space on the / filesystem
Thanks, I updated via sfos-upgrade. In the terminal it told me that the droid-system package need 137MB more space. Although I already uninstalled the android support package. So I removed a couple of apps and now it works.
That raised the question in me why the system partition is just 5.7GB? That seems quite small.
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Yes. Only by reflashing. With the bigger root partition, getting the subsequent OS updates OTA will be easier.
(a bit of a chicken-egg problem)
One folder to clean up and gain more space is /var/tmp. I had rubbish worth 500 MB in there.
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Still no 4g eh? When can i expect to use my mobile phone as a mobile phone? 
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I’m wondering too missing 4G.
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It’s in black and white:
Disabling 4G makes it not a mobile phone
Despite the difficulties I have with the hardware I decided to keep the C2 because I want to support Jolla. I like the OS and want to use it as much as possible. Also I saw on AmazonGermany that they sell book cases for this device, so hopefully with such a case the device becomes a bit more comfortable.
So I took it out of the box again and after rebooting the push for entering the code and for the pulley menu appeared for the first time. Good. I downloaded and installed Sailfish Tampella. That went well. The device is very slow, especially when visiting Jolla shop a lot of patience is needed. Security code is asked often.
Calling: receiving calls works with 2G. My sim is from Simyo, a daughter of KPN, The Netherlands. (What a flimsy sim tray by the way.) Soon I am in the UK, visiting family. Now I wonder if it will work on 2G while I am there. Or do I have to put my sim in another device? Who knows more about this?
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When I want to reflash, where can one find an flashing instruction and the proper image to download?
Please updatebto 5.0.0.29 if possible, than your phone should run faster and smoother …