FurryNutz, 10x, appreciate your reply here.
Took some time to research this issue, including advice from D-link Israel Support.
According to the label at the back of the router here are the technicalities of the firmware/model:
P/N: XXX655EEU....A4G
H/W Ver.:A4
F/W Ver.:1.21WW
Mind you, the firmware after updating it few years ago is:1.34WW.
According to the D-link Israel support's reply, the latest most updated firmware for my device can be found at
ftp://ftp.dlink.ru/pub/Router/DIR-655/Firmware/REV_A/.
Interestingly, it's from D-link Russia, so I'm afraid engaging with this, moreover according to the router's label as stated above, I think the EU letters showing, suggests that the router can handle well EU firmwares, is that a correct assumption?
Needless to say that EU firmwares for this router that are much more recent do exist, so I've ruled out the NA firmwares, but what about the EU ones?
Thanks again