After a big big search I have found a location for some of the Firmware updates for this decoder.
Version available 1.41, 1.42 and 1.44
Versions available for Old Remote (Grey and Black):
These are the file names
I have upgraded from 1.41 to 1.42 and I am impressed on how much channel decryption has improved, there is far less channel freezing than with previous 1.3X and 1.40/41.
Also tested 1.44 and unfortunately it seem more jerky although not as bad as 1.40
I say unfortunately as once installed
The other updates as follows I belive are for the New Remote (Black) as my decoder (with the old remote) would not even start the upgrade.
Although these are flagged as "ANCIEN TÉLÉCOMMANDE" that is wrong at those did not work with the ancient (new) remote.
I have also been in doubt as I got the GN-2500HD/NEW Decoder where the remote supplied was the grey one where I would have thought to get the black remote instead.
Opposite to the links above these link should work for you if you have the correct 2500 model (not the one above):
There is also the Serial Firmware tool ( To Patch the box via serial cable RS232) instead of the USB method which I have used with no issues.
(I tried although I am not sure I was using the right cable as it did not work)
All this is available at http:/*******
I have recalculated the link from a blocked Facebook link because of a security issue but with the link above you wont have any problems.
I have stored copies of these in case even this site will go down and post on my google account.
(Please do not bother downloading the IDM Tools on this page as these have nothing to do with Firmware) I believe it's a Google Chrome Browser Download Manager, probably even a scamware.
I have noticed on other forums that there should be also version 1.46 for the Geant GN2500 but I have tested these and they're all fake,broken and spywares.
Hope this helps others who have been hunting these firmwares for a while like me.