Cannot upgrade CCR1036 from 6.38.5 to 6.39.2

Hi all,

I have a problem with a CCR1036-8G-2S+ running RouterOs 6.38.5 and bios firmware 3.33.
I perform system → packages → Check for updates
It correctly find new stable version available (6.39.2). I download it succesfully.

Now I have the file on the disk:

[admin@routername] > /file print
 # NAME                                                     TYPE                                                           SIZE CREATION-TIME      
 0 skins                                                    directory                                                           jun/07/2015 13:34:09
 1 pub                                                      directory                                                           jun/07/2015 13:34:13
 2 web-proxy1                                               web-proxy store                                                     jul/06/2017 01:19:25
 3 routeros-tile-6.39.2.npk                                 package                                                     15.5MiB jul/06/2017 01:40:16

Then, I do a “system reboot”.

The CCR reboots but the version remains 6.38.5.
The log only shows “router rebooted” as the first line. No errors.
npk file is still present.

Does anybody have any suggestion?

Thank you.
Massimo