What should i do? any config or smth?

The bedrock removal features from the mod itself unfortunately only work when freshly generating a new world.

So the only thing you can do at this stage is to go into creative mode and remove the bedrock manually or use a command like /fill ~-64 1 ~-64 ~63 4 ~63 minecraft:stone replace minecraft:bedrock (change the y values 1 and 4 to the actual heights where the bedrock is).

Did you actually add the mod after the world was already generated?

There is probably Bedrock on the other side that wasn't removed from world gen.

How can i make it work again then? Please playin with friends already with 10h in world.

I generated it on SMP then added it on MPP but when i removed bedrock in nether. Nether was broken. So do i type this commmand in overworld or nether?

'replace' is not a state for block minecraft:stone is what it gives me when i type the command

/fill ~-64 1 ~-64 ~63 4 ~63 minecraft:stone replace minecraft:bedrock would be for overworld.
/fill ~-64 123 ~-64 ~63 126 ~63 minecraft:netherrack replace minecraft:bedrock would be for nether ceiling.

These are basically vanilla block fill commands that replace all bedrock blocks in a certain height range with stone / netherrack within a 64 block radius around the player.

I'm now working on retroactive bedrock removal and adding more efficient commands for these kind of things.

I've implemented the retro-gen command now in v0.1.9 and wrote a small tutorial for it in the wiki.