The phrase Netboom Ini Fix Coin is not an official error message you will find in Netboom's documentation or customer support pages. Instead, it appears to be a phrase used by users to describe problems related to three distinct aspects of the service:
There are no credible reports or success stories from users who have fixed coin issues by modifying any INI file. What you find online are likely scams or outdated information that doesn't apply to current versions of Netboom. Netboom Ini Fix Coin