mutable/immutable persistence-file switch(on/off)

[Tinkerman]

Hello

I was trying an alternative to remastering Serena (Linuxmint) live-distro.

I used the Ventoy Persistence Plugin to get Serena to use it. (It worked)

Then I made the customizations; and rebooted to mark the persistence.dat "chmod 444 ".

But Serena still writes to it (this is not the behavior that i need)

I was searching the site for making persistence file switchable between mutable and immutable: a method to let the distros treat its persistence-file like a base, readonly, live-medium. All union changes would be discarded on shutdown. 


Or is there a simple user solution that I can try?