I don't really want to recover. Isn't there another way?
First a few remarks.
To use Lumia camera 5 you need the DENIM update.
If you installed preview for developer and the box in the app is marked it may "block" the "check for updates" for DENIM.
Now there are also (but fewer) reports that you need to mark the PFD box.
If you have pfd then the info in Extras+info can be the reason it show DENIM but you only have CYAN. (and enable or disable the pfd shows different results)
What is the test in Extras+INFO under Mobile operator xxx-yy (just that I can double check)
What is the OS and firmware version you have.
Now it also happened that even in the MS link DENIM was released that phone could not find and update. (happened for the CV-HK for the 1520 and for the 630 CV-UK)
If the update is releases but your phone does not "find" it you could use the Lumia (or Windows) Software Recovery Tool. First to check if the DENIM is on the "server" and if so you could install it.
what you could try.
Double check if date and time is correct for your location.
Sync you MS account.
Delete temporary files with Storage Sense.
Do a Soft reset.
Disable the box in pfd and check for updates.
Enable the box in pfd and check for updates.
So please try above and report the result.