background image

Switching Between Project Zomboid B41 and B42 - Archivio Domande

  1. Home
  2. Archivio Domande
  3. Project Zomboid
  4. Switching Between Project Zomboid B41 and B42
Knowledge Base Apri un ticket Ticket aperti
Game Servers 380 7 Days to Die 4 Abiotic Factor 2 Aloft 2 alt:V 2 Americas Army Proving Grounds 2 Among Us 2 Archean 2 ARK Survival Ascended 6 ARK Survival Evolved 3 Arma 3 3 Arma Reforger 2 Aska 2 AssaultCube 2 Assetto Corsa 3 Astro Colony 2 Astroneer 2 Automobilista 2 2 Avorion 2 Banana Shooter 2 Barotrauma 3 BATTALION Legacy 2 BeamNG.drive (BeamMP) 2 Black Mesa 2 Brickadia 2 Call of Duty 2 Citadel: Forged with Fire 2 ClassiCube 2 Clone Hero 2 Colony Survival 2 Conan Exiles 4 Contagion 2 Core Keeper 2 Counter-Strike 2 3 Craftopia 2 CryoFall 2 CS2D 2 Cube 2: Sauerbraten 2 Cubic Odyssey 2 DayZ 4 DDNet 2 DDRaceNetwork 2 Dead Matter 2 Dont Starve Together 4 Eco 2 Empyrion Galactic Survival 2 Enshrouded 3 Escape from Tarkov 2 Euro Truck Simulator 2 2 Factorio 2 Farming Simulator 25 2 Fistful of Frags 2 FiveM 3 FortressCraft Evolved 2 Foundry 2 Foundry VTT 2 Frozen Flame 2 FTL Tachyon 2 Garrys Mod 3 Ground Branch 2 Half-Life 2 Deathmatch 2 Hogwarp 2 Holdfast: Nations at War 2 HumanitZ 2 Hurtworld 2 Hytale 1 Icarus 2 Insurgency Sandstorm 2 IOSoccer 2 Just Cause 3 Multiplayer 2 Kerbal Space Program 2 Killing Floor 2 3 LeagueSandbox 2 Left 4 Dead 2 Left 4 Dead 2 3 Longvinter 2 Los Angeles Crimes 2 Medal of Honor 2 Midnight Ghost Hunt 2 Mindustry 2 Minecraft 4 Minetest 2 Modiverse 2 Mordhau 3 Mount & Blade II: Bannerlord 2 Myth of Empires 2 Nazi Zombies Portable 2 Necesse 2 NeosVR 2 Neverwinter Nights EE 2 Night of the Dead 2 Nightingale 2 No Love Lost 2 No More Room in Hell 2 No One Survived 2 Nova-Life Amboise 2 Nuclear Option 2 Onset 2 Open Fortress 2 OpenArena 2 OpenRA 2 OpenRCT2 2 OpenTTD 2 Operation Harsh Doorstop 2 Palworld 3 Path of Titans 2 Pavlov VR 3 PixARK 2 Plains of Pain 2 Portal Knights 2 Post Scriptum 2 Project Zomboid 8 Puck 2 Quake Live 2 R5Reloaded 2 RedM 2 Renown 2 Resonite 2 Return to Moria 2 Rimworld Together 2 Rising World 2 Risk of Rain 2 1 Rust 4 Satisfactory 1 SCP Secret Laboratory 3 SCUM 2 Smalland 2 Solace Crafting 2 Soldat 2 Soldat 2 2 Sonic Robo Blast 2 2 Sons of the Forest 2 Soulmask 2 SourceCoop 2 Space Engineers 3 Space Station 14 2 Squad 3 Starbound 3 StarMade 2 Stationeers 2 Stormworks 2 Subnautica Nitrox 2 Sunkenland 2 SuperTuxKart 2 Sven Co-op 2 Swords 'n Magic and Stuff 2 Team Fortress 2 3 Teeworlds 2 Terraria 3 TerraTech Worlds 2 TF2 Classified 2 The Forest 3 The Front 2 The Isle 2 Tower Unite 2 Trackmania 2 Unturned 4 Urban Terror 2 V Rising 3 Valheim 3 VEIN 2 Veloren 2 Vintage Story 3 Voyagers of Nera 2 Wolfenstein: Enemy Territory 2 Wreckfest 2 Wurm Unlimited 2 Xonotic 2 Zandronum 2 Getting Started 2 Network & Connectivity 1 Server Management 2
Supporto
Categorie

Switching Between Project Zomboid B41 and B42

zomboid pz b41 b42 switch 0 hanno trovato utile questo articolo
Disponibile in: ESPAÑOL

This guide explains how to switch your Project Zomboid server between Build 41 (B41) and Build 42 (B42) through GPanel. It covers save compatibility, backing up your world, and performing the switch yourself.

B41 and B42 saves are not compatible. A world created in Build 41 cannot be loaded in Build 42, and a world created in Build 42 cannot be loaded in Build 41. Switching builds will leave your existing world unplayable on the new version. Back up your save before switching.
Why do people switch back to B41? Build 42 is still in active development. Certain mods, server configurations, or newly introduced bugs may cause instability. If your server is experiencing crashes or compatibility issues that are linked to B42, reverting to B41 is a supported option. Likewise, if you are ready to move from B41 to the newer B42, you can do so at any time through GPanel.

Before You Switch: Understand the Save Compatibility Issue

Project Zomboid stores all world and player data in a save folder tied to the build version it was created with. The two builds use different formats for map chunks, item definitions, and player character data.

Build Steam Beta Branch Can Use B41 Saves? Can Use B42 Saves?
Build 41 (B41) (blank/empty) Yes No
Build 42 (B42) unstable No Yes

The beta branch is set in the Startup tab of your GPanel server.

When the switch is completed, your server will start fresh on the new build. Any existing world on the previous build will still be present in the save folder, but the server will not load it. It will not be deleted automatically — it simply will not be used. You must either change your server name or delete existing save data before starting on the new build.

You will need to start a new world after switching. Plan accordingly — inform your players before switching so they are aware that character progress and map exploration will not carry over from the old build.

Step 1 — Back Up Your Current World

Before switching builds, download a copy of your current save. Even if you do not plan to return to the old build, having a backup protects against accidental data loss and gives you something to restore if circumstances change.

Option A: Backup via GPanel

  1. Log in to GPanel and select your Project Zomboid server.
  2. Stop the server using the Stop button on the Console tab and wait for the status to show Offline.
  3. Navigate to the Backups tab in GPanel.
  4. Click Create Backup and wait for it to complete. The backup will appear in the list below.
  5. Once the backup is listed, click the download icon to save it locally.
gpanel-backups-tab

Option B: Download the Save Folder via SFTP

If you want to download only the world save data rather than a full server backup, connect to your server via SFTP and download the save folder manually.

  1. In GPanel, go to the SFTP tab and note your SFTP hostname, port, username, and password.
  2. Open an SFTP client such as FileZilla and connect using those credentials.
  3. Navigate to the world save directory:
    /home/container/.cache/saves/multiplayer/<YourWorldName>/
  4. Download the entire <YourWorldName> folder to your local machine.

Step 2 — Switch the Build in GPanel

Switching between B41 and B42 is done through your server's startup options. No support ticket is needed.

  1. Log in to GPanel and select your Project Zomboid server.
  2. Make sure the server is stopped.
  3. Go to the Startup tab.
  4. Locate the Beta Branch field:
    • To switch to B41: leave the Beta Branch field blank (empty).
    • To switch to B42: enter unstable in the Beta Branch field.
  5. Change the Server Name in the Startup tab to a new name that differs from your current one. This prevents the new build from trying to load incompatible save data.
  6. Go to the Settings tab and click Reinstall Server. This downloads the correct game files for the selected build.
  7. Start the server. It will generate a fresh world under the new server name.
Alternative: keep your settings without changing the server name. Instead of changing the server name, you can delete all files on the server except the .cache/ folder, then reinstall. The .cache/ folder contains your server configuration, so this preserves your settings while ensuring a clean game installation for the new build. Only use this method if you do not want to change your server name — note that save data under the old server name will need to be deleted manually from .cache/saves/multiplayer/.

Mod Compatibility After Switching

Mods are not compatible across builds. A mod written for B41 will not work on B42, and vice versa. After switching, you will need to review and replace your entire mod list.

  • Switching from B41 to B42: Most popular B41 mods have been updated or replaced with B42 versions. Check the Steam Workshop for B42-specific versions of the mods you were running. Note that the WorkshopItems format also changed in B42 — see the mod installation guide for the correct B42 format.
  • Switching from B42 to B41: B42 mods will not load on B41. You must find and install the original B41 versions of any mods you want to use. Check the Steam Workshop for mod authors who maintain separate B41 branches.
Clear your mod list before the switch. If you leave B42 mods in your configuration and then switch to B41 (or vice versa), the server will attempt to load mods that are incompatible with the running build. This typically prevents the server from starting. After the switch, go to the Startup or Configuration tab in GPanel, clear the WorkshopItems and Mods fields, and save before starting the server for the first time on the new build.

Frequently Asked Questions

Can I keep my B41 world and also have a B42 world?

Not on the same server simultaneously — a single server instance runs one build at a time. However, your B41 save files remain on disk after switching to B42. If you switch back to B41 in the future and restore the original server name, the old save can be loaded again. Your previous save data is stored in .cache/saves/multiplayer/ and is not deleted automatically during a build switch.

Will switching back to B41 cost anything?

No. The build switch is done entirely through GPanel at no extra charge. Project Zomboid B41 and B42 server slots are priced the same at Legion Hosting.

My players are getting a version mismatch error after the switch

This means the server and the player's game client are on different build versions. Players need to match their Steam beta branch to the server's build:

  1. In Steam, right-click Project Zomboid and select Properties.
  2. Click the Betas tab.
  3. From the dropdown, select None — this gives you the current default build (B41).
  4. If the server is running B42, select unstable instead.
  5. Wait for Steam to update the game, then launch and connect.

Still need help?

If you run into issues during the switch, open a support ticket and we will assist you.

Questo articolo ti è stato utile?
Aiuta a migliorare

Articoli correlati

How to Reset or Wipe Your Project Zomboid Server World
This guide walks you through resetting or wiping your Project Zomboid server world on Legion Hosting... How to Add Mods to Your Project Zomboid Server
This guide walks you through installing Steam Workshop mods on your Project Zomboid server hosted wi... Project Zomboid Server Settings
This guide covers how to configure your Project Zomboid server hosted with Legion Hosting — includin... Fixing Project Zomboid Server Crashes
Project Zomboid servers can crash or fail to start for several well-known reasons. This guide covers... How to Connect to Your Project Zomboid Server
This guide walks you through every step needed to join your Project Zomboid server hosted with Legio...
Indietro

Ready to Get Started?

The servers are booted, select your plan and become our latest satisfied client.