It's possible to install another code firmware?

[BrunoShady]

If I have a XXXXX code Lumia 820, it's possibile to install a YYYYY firmware?

 

[rockstarzzz]

Yes you can - however this may or may not brick your phone (fixable if you follow stickies on the forum). But this also means you won't get any future OTAs on your phone that are official.

 

[index1366]

Is this about the inability to receive further OTA updates true, or is it reversible by flashing the original firmware, that came with the phone from the factory? .

 

[rockstarzzz]

Is this about the inability to receive further OTA updates true, or is it reversible by flashing the original firmware, that came with the phone from the factory? .

Of course if you revert to original firmware you aren't on a different firmware than your device code so inability to get OTA updates nullifies but if you don't re-flash then on a non standard firmware OTA are a no go