Regardless of the method you choose, make sure to test the decompiled MQ4 file thoroughly to ensure it works as expected.
There are a few methods to attempt this conversion, but note that success can vary based on the complexity of the original code and the methods used. Here's a guide on how to approach this: how to convert ex4 to mq4 free upd
Converting an EX4 file to an MQ4 file involves reversing the compilation process, as EX4 files are compiled versions of MQ4 files used in MetaTrader 4. The MQ4 file is the source code, which can be edited and compiled into an EX4 file for execution in the MetaTrader 4 platform. However, directly converting an EX4 file back into an editable MQ4 file isn't straightforward because the compilation process loses some information. Regardless of the method you choose, make sure
Instead of searching for a decompiler, consider these more effective paths: The MQ4 file is the source code, which
: Many "free" download links for decompilers are flagged as high-risk malware or trojans. Legitimate Alternatives to Decompiling