Pokémon Masters EX continues to thrive in 2025 with new features like Galactic Frontier Legendary Gauntlets and Cross-Progression Sync. Yet, errors like Error 20101 (Connection Lost) or Sync Pair download failures still plague trainers. This guide merges proven fixes with 2025-specific solutions (tested on Android 16, iOS 19, and Steam) to keep you battling without interruptions.

1. Error Code 20101: Connection Lost (2025 Fixes)
Why It’s Still Happening:
- 5G/6G network handoff bugs during global co-op raids.
- Conflicts with Cross-Progression (switching between Steam and mobile).
Symptoms:
- “Connection lost” alerts mid-battle.
- Frozen lobby screens during Galactic Frontier events.

Fixes:
1️⃣ Switch to IPv4 Networks
Modern 2025 routers often default to IPv6, which clashes with Pokémon Masters’ servers. Adjust router settings or contact your ISP.
2️⃣ Pre-Download Event Assets
Go to Settings > Download All Assets before major updates to avoid mid-game disruptions.
2. Error Code 20103: Data Sync Failure
2025 Triggers:
- Cloud Save conflicts between devices.
- Corrupted data from 4K sync move animations.
Fixes:
1️⃣ Force Manual Cloud Save
Go to Menu > Account > Back Up Now to override corrupted auto-saves.
2️⃣ Free Up 20% Device Storage
Pokémon Masters EX now requires 5GB+ free space for 4K assets. Delete unused apps or files.
3️⃣ Disable Battery Optimization
Android: Settings > Apps > Pokémon Masters > Battery > Unrestricted.
iOS: Disable Low Power Mode during gameplay.
3. Error Code 20107: In-Game Purchase Failed
2025-Specific Causes:
- Regional pricing mismatches on Cross-Progression accounts.
- Google Play/App Store token expiration.

Fixes:
1️⃣ Use Same Region for All Devices
Purchases on Steam (EU) won’t sync to mobile (US). Stick to one region.
2️⃣ Refresh Payment Tokens
Android: Google Pay > Settings > Update Payment Method.
iOS: App Store > Profile > Payment Information > Re-enter Details.
3️⃣ Check DeNA’s Purchase FAQ
Follow this guide for flagged transactions.
Latest 2025 Error Codes
Error Code 20109: “Cloud Sync Disabled”
- Cause: Cross-Progression conflicts with third-party apps (e.g., Discord overlay).
- Fix: Disable overlays and re-enable sync via Nintendo Account.
Error Code 20111: “Stamina Not Refreshing”
- Fix:
- Unlink and relink Nintendo Account.
- Avoid time-zone exploits (triggers anti-cheat locks).
Sync Pair Download Loop
Preventative Tips for 2025
- Daily Cache Wipe
- Join the Beta Program: Test updates early via TestFlight (iOS) or Steam Beta.
- Avoid APK Mods: Third-party sync pair mods trigger Error 20105 (bans).
- Always keep eyes on their news section.
Need More Help:
- Resolving Common Pokémon Masters Error Codes
- Pokémon Go Errors in 2025: Fix GPS, Raid, Authentication & Party Glitches (Updated)

Awill Guru is a technology enthusiast with degrees in VLSI Engineering (B.Tech, M.Tech) and Android Development. Their passion for education drives them to teach and share knowledge through their blog. He also hold qualifications in Sociology (M.A.) and Education (B.Ed), along with NIELIT O and A Level certifications.