Several Switch 2 users have reported online console bans after using the Mig Flash cartridge, which enables playing Switch games loaded from an SD card without modifying the console.
The Mig Flash developers recently released a firmware update allowing the device to run original Switch games on the Switch 2. However, multiple users claim their consoles were banned from Nintendo’s online servers, even when only running backups of games they legally purchased.
A well-known hacking news account, Switch Tools, shared their experience: their Switch 2 was banned after using Mig Flash with legitimate game backups. They advised against using the Mig Flash, calling it increasingly risky on the new console.
Nintendo employs cryptographic certificates to identify instances of game piracy, detecting when multiple consoles use the same security signature. This system targets the sharing of pirated game copies.
Despite this, Mig Flash supports backing up and playing legally owned games, which should not trigger conflicts in cryptographic signatures. The device’s official website emphasizes that only backups of personal games are supported for online play. It warns that violating this rule can result in Nintendo banning the user from online services and disclaims responsibility for such bans.