He remembered a forum post he’d scavenged through two nights ago. Victron didn't use a single universal "backdoor" password for the public for obvious safety reasons. The passwords were typically specific to the distributor or the region, encoded to ensure that only a certified installer—who understood the local regulations—could change the grid standard.
Here’s a concise, informative piece on : grid code password victron
Which are you using (e.g., MultiPlus-II 3000)? He remembered a forum post he’d scavenged through