Setup went through with one minor issue:
After selection to install the update I did have to reboot the phone for 5 times because touch screen didn’t respond when I tried to enter the pin code.
After the 5th reboot it took about 30 seconds until it was possible to enter the pin code.
Rest of the update went smooth and everything I use that worked before works still.
Returned, Reflashed C2 back in business.
Update went through without a hitch this time.
Thank you Jollybois & Jolla Crew! 
Absolutely! It feels somehow wrong to feel that way though.
If your brain is playing tricks on you, just try pocketing the thing to reset any illusion. 
EDIT: Unrelated! Solved with nephros workaround!
After several hours of stable run of 5.0.0.29 (native browser, calls, SMS, Viber) phone suddenly went berserk.
First I noticed that SMS can’t be send. Mobile network was not visible so I went to the settings. I noticed that SIM was not recognised.
After C2 restart I tried to reenable SIM same as was always needed before. It seemed to accepted PIN but indicators for SIM enablement started to pulsate. Restarts don’t help.
WiFi does work so ssh is possible and it shows that several crucial services are failed:
$ ssh 'defaultuser@JollaC2'
Last login: Thu Nov 14 22:23:39 2024 from XXX.XXX.XXX.XXX
,---
| Sailfish OS 5.0.0.29 (Tampella)
'---
[defaultuser@JollaC2 ~]$ systemctl --failed
UNIT LOAD ACTIVE SUB DESCRIPTION
● lxc@multi-user.service loaded failed failed LXC Container: multi-user
● ofono.service loaded failed failed Telephony service
● pulseaudio.service loaded failed failed PulseAudio (system-wide mode)
LOAD = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB = The low-level unit activation state, values depend on unit type.
3 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.
[defaultuser@JollaC2 ~]$
I did some ‘brave things’ but I didn’t anticipated this. It might not even be related.
I tried to install and failed Chum, Meecast event view. Soon after start I installed Situations which seemed to work in initial setup. After I added some addition extensions it crashed. Later starts of app didn’t reach functional state. So I uninstalled it.
C2 is unfortunately unusable now as a daily driver.
Any insight?
No issues with the update. Nice work Sailors!
The lxc and pulseaudio failures are “normal”, the ofono one is not.
I’ve had this problem recently, see my solution in this bug report:
How did you try to install Chum ?
After the upgrade, I have the impression that everything and overall the UI is more snappy.
Thanks for saving my daily driver!
I failed and it seems that it’s unrelated. See bug report from nephros for details. So I guess it doesn’t matter.
I cannot disable sim. I have now one sim installed. It is always active I cannot tick it off.
Now I think wifi is working because C2 is downloading update. I’m waiting patiently if it will work.
I have one SIM too. Just enable the empty one and then you can disable the one with SIM.
Ok, thanks it was so easy.
Now C2 is updated to version 5.0.0.29. I succeeded. 
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.