Want to PREVENT automatic firmware updates & other changes

Question

OJ 8600 Pro.  Wireless network setup. 
I want to prevent automatic updates.
There must be a way to stop automatic firmware / software updates.  I've not found it.
"If it ain't broke, don't fix it."  Especially printers.
People update firmware / software (not just HP) & some things suddenly don't work.
I don't update * anything * until I know what it is.
 I just installed some new, non-HP cartridges.  Suddenly, the printer is accessing the internet & "downloading."  It flashed by quickly on the printer display & I couldn't read everything it said .
At the same time, it said something like "... then web printing will also be activated."
I specifically DISabled that, in the EWS, when I 1st  setup the printer.  Don't want web printing, don't need it.
Now, because I replace some carts, it's going to re-enable it for me?  Talk about brass balls.
I cancelled that download / shut printer down.  But sure enough, it had switched my settings & re-enabled web printing.  (I disabled it again).
The next power on, printer resumed some download.  It didn't bother saying what - just showed, "X of Y downloaded" & showed the progress.  I immediately cancelled it again.
If there aren't settings to prevent any automatic FW / software updates, or if it just ignores them, I'll have to bury the printer far under the firewall.
Thanks.
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Answer 1

Thanks RnR.
Here's one method of using a router to prevent devices from accessing internet, that should work for many users.
I decided to use my router to block the printer's internet access.  This can quickly & easily be reversed or modified.  It involves 2 basic steps:
1. Assign the printer a static IP address.
2. Use router settings to deny internet access for the static address.
I have a Cisco / Linksys router, but many brands & models have these basic features, that are accessible from the router's EWS (embedded web server), through a web browser.
HP support has detailed instructions on assigning static IP addresses for most printer.
Here is one HP document covering that for my OJ Pro 8600 & some other models:  http://support.hp.com/us-en/document/c03781399/
It may be easier for most users to assign an HP printer a static address, using the printer's EWS rather than the printer display.
Note:  generally, when using a router to assign a static IPa for devices that the router would otherwise be assigning automatically (via 'DHCP'), the static address chosen is outside of the current range of addresses, that the router can use to assign addresses to the devices connected to it.  In many routers, what the current range of addresses it can choose from to assign DHCP addresses is visible under some section / tab of the router EWS.
In my Cisco, the current DHCP range is shown under the Setup -- Basic Setup -- DHCP section:
"IP Address Range:  192.168.2.60 to 192.168.2.109"
So, I chose a static printer address outside that (192.168.2.XXX).
You should write down & save the selected IPa, in case there's any problem getting it from the printer later (shouldn't be, but...).
Assigning the printer a static IPa hasn't affected accessing its EWS (for me).
Once the static IPa is assigned & recognized (by the router), use the router's settings to block that address from internet access.  In my Cisco, it's under "Access Restrictions."  (You may have to power the printer on / off; possibly reboot some computers, for the new static address to be recognized.)  Here's how I did in the Cisco:
Log on to the router EWS (default login name & password is admin/admin.  You should always change router PASSWORD from factory defaults, for security reasons - so your neighbor or kid can't remotely hack into your router).
Go to "Access Restrictions" tab or similar.
Click "edit list of PC's" and put in the "MAC address" of the printer. (found in the printer's network config / settings).
Save the MAC address settings.
Back on the router main Internet Access page, give this internet access policy (rule) a name.
Then click "Deny Access."
Check "Everyday" and "24 hours" for times, to block the IPa continuously.
Save the settings.
Now the router won't allow that address to access the internet - during the times specified, but the device (printer) can still communicate on the local network - all the time.
The same can be done for specific computers.  Like to block kids' computers from internet access on certains days / hours.