Connect to Larian (cloud saves) without updating PS5 fm?

So… My ps5 is on 14.00 (yeah, I know…) and I'd like to connect to Larian server within Baldur's Gate 3 to backup my saves onto my Larian account. Now it wants the PSN login for that… Does anyone know of a way around it? Like maybe using the web browser or a router filter to connect to PSN while avoiding the update? I'd really prefer to avoid going into 14.10

I've tested that the game can connect fine to the internet without it… I could connect to mod.io and download new mods while having set a manual DNS for the jailbreak (and so despite having the console tell me it can't connect online in it's settings menu).

Please note I'm quite noobish on the JB scene, so apologies if my question is silly (and yeah, I shouldn't have updated but I was not following stuff before last week..)

Too bad I can't use Garlic save manager, to bypass the silly limitations on save files size and backuping options that are forced upon us… thanks at least to Larian for their own cloud so i can backup the files on my Pc…

My thanks in advance for your advices! ^_^