Older builds used simple bytecode that was easy to reverse. Newer builds compile into complex machine instructions.
Be extremely cautious of any tool claiming to be the Modern MT4 encryption is highly sophisticated. Most "free" tools are scams, and most "paid" software is outdated.
If you search online for "EX4 to MQ4 decompiler build 40432," you will find hundreds of results. Here is the breakdown of what you will actually find:
This is the most prevalent category. Scammers know that users are desperate to recover their code. They create sleek websites claiming to have the "Best Updated Decompiler 2024/2025" supporting build 40432.
Using the iCustom() function to call the EX4 file's outputs from a new script.
How to decompile ex4 file to mq4 [closed] - mql4 - Stack Overflow
: The most reliable way to get an MQ4 file is to request the source from the original author.