AMSI.NotFail is a symbolic PowerShell solver designed to analyze and deobfuscate expressions that aim to bypass the Anti-Malware Scan Interface (AMSI). Unlike AMSI.fail, which generates randomized and obfuscated bypass payloads, AMSI.NotFail focuses on interpreting and symbolically executing these payloads to reveal their true behavior. By tracing symbolic constants and evaluating internal representations step-by-step, this tool helps analysts understand how obfuscation attempts work—and why they fail to evade detection when properly interpreted.