Not sure when it will be stable.
Bad news on the Mortal Online 2 front; the game is performing a 24 hour rollback due to deep issues that cropped up following a recent patch. A post on the Discord confirms that all progress will be reverted, meaning new characters will be deleted and deleted characters will return.
Community manager Robmo also states that he does not know when the devs will ensure smooth sailing going forward.
While the Dev team is working on the issues and server, I will inform you of what is happening. Right now, they are performing a 24 hour rollback on the servers. What will happen is 24 hours since the server went down, ALL progress will revert to 24 hours earlier. This includes Nave and Haven. The reason this is being done is that the issues were deep. Joe is currently applying a fix to the servers and queue to fix the last patch problems. This could not have been done without the server rollback due to how “corrupt” things were. I currently do not have an ETA. If you created a character during that period, they will not be around. If you deleted a character during that time, they will return.
I will repeat I do not have an ETA while the devs ensure things will go smoothly.
Source: Mortal Online 2 Discord