If you’re seeing ! Installation failed (Error 1) while trying to flash Magisk (either via the Magisk app (Direct Install) or custom recovery like TWRP), it means the installation script stopped because of a critical issue. Error 1 is generic, but the reason is almost always printed just above it. Common Causes & Fixes 1. Corrupted or Incompatible Magisk Zip Error clue: Unable to extract zip file or Zip signature verification failed
macOS Catalina required
