Broken RocketChat server after update snap package from 3.18.7 to 4.x/stable: 4.8.1

Hello everyone, that’s my first topic on this forum and I want to apologize on my bad English, but I hope everyone understanding me.
Sometimes I used google translate.

So, i broke my server rocketchat. I have very old server with Ubuntu 18.04 LTS. Always when I am log in before what I’m do I update all my system, apt update && upgrade and snap refresh. Yesterday rocketchat send my a email wher informed me “there exist a critical security vulnerability”. So I decide to log in and upgrade rocketchat to stable version 4.8.1. Everything was ok, but couple minutes after rocketchat send my another email. MongoDB Deprecated
MongoDB version 3.6.23 is deprecated, please upgrade your installation.

My first mistake: I don’t have any backup or snapshot on my vm.
Second mistake: I wrote wrong command to update rocketchat. I put sudo snap refresh rocketchat-server
sudo snap refresh rocketchat-server --channel=x.x.x/stable
sudo snap switch rocketchat-server --channel=x.x/stable

Now i have in my website: Client sent an HTTP request to an HTTPS server.
I tried this solution (Error upgrading to 4.2.2 (latest stable) from 3.18.3) but still nothing.

Question: It’s really bad? Can I fix this?

There is a whole command line from my console. Welcome to Ubuntu 18.04.6 LTS (GNU/Linux 4.15.0-175-generic x86_64) * Docu -

I will be very grateful for help.

Server Setup Information

  • Version of Rocket.Chat Server: 4.8.1
  • Operating System: Ubuntu 18.04.6 LTS
  • Deployment Method: Snap
  • Number of Running Instances: 1
  • DB Replicaset Oplog:
  • NodeJS Version:
  • MongoDB Version: 3.6.23
  • Proxy:
  • Firewalls involved:

Today I have another problem. I don’t know how, but my server running now ok except one thing. Website show me two different mongodb versions.