You won't receive official security patches from Avast, leaving your phone vulnerable to new threats.
The "modder" may have altered the app's code to redirect your data to their own servers. Better Alternatives
If you're looking for high-quality mobile protection without the risks of a modded file, consider these options:
Scheduling scans that are usually restricted in the free version. ⚠️ Important Security Warning
Typically, "modded" versions of Avast Mobile Security (often labeled as Pro, Premium, or Unlocked) claim to offer the following: Common Modded Features