gateway 3ds troubleshoot - how to solve GW3ds card problems

The frequent problems that happen to Gateway 3ds are listed below:

1) Gateway Mode fails to relaunch (hang for longer than 20 sec, black screens or main menu error):

• Make sure 3DS is running system version 4.1 -> 4.5
• Check Launcher.dat is in the root directory of the SD card of the 3DS
• Confirm 3DS can read/write to SD card (Try freshly formated card, 3DS should pop up message on card insertion
• Re-Run Blue card Gateway Installer

2 )No banner pops up on red Gateway insertion

• Make sure you are in Gateway mode (Settings -> Other -> Profile-> DS Prof. -> wait for reboot)
• Make sure your backup is the correct region for your console
• Make sure you are binary writing the backup to the micro SD card.