JPEXS Free Flash Decompiler Issue Tracker

If you are looking for the decompiler itself, visit

+ update 2020: WARNING - support of the decompiler is now VERY LIMITED. There are no active developers. This means we will NOT develop new features and/or fix most of bugs. We left the tracker running in case somebody from community would like to work on it. Sorry for the inconvenience.

List of issuesList of issues

#1229 Changing the script via P-Code/HEX not work correctly
Date created:
Type: bug
Visibility: Everybody
Assigned to:
State: new Help

> What steps will reproduce the problem? I was trying to change a script via P-code/hex... Im not sure if I found the good thing, but its just enabled the HEX and P-code browsing and editing. The assigning the P-codes/HEX positions with code positions is little broken (when I click to an variable in P-code, in script the cursor went absolutly wrong), but anyway, I found the good thing and changed (think) pushtrue to pushfalse. After script recompile its shows a variable = false. So nice, I saved that, but when is thread with the edited segment is executed, its froze. Hmm, maybe I doing something wrong? The sizes of SWFs are different, but I tried load the original SWF and Saving as recompiled (but same script), the size changed too but SWF works good (but without changes). Next I tried to negate a condition what the boolean is used, I successfully did it, but same behavior, its froze. > What is the expected output? What do you see instead? I wanted to pass the authentication, so the condition to change password to random string will not be executed. > What version of the product are you using? Is it "nightly build"? Which operating system do you have? 8.0.1, Windows 10 Pro 64bit. > Please provide any additional information below. If the problem is related to a SWF file, attach it here, otherwise we can't help you. Well, I think the ANY change of P-Code will broke whole script (script what I editing is HUGE), I think some function names are broken etc. I tried to manually edit the hex (27 = pushtrue to 26 = pushfalse), but same behavior.
So if i understood correctly you edited the appropriate byte (in the uncompressed SWF) with a hex editor from 27 to 26 (pushtrue to pushfalse), and the problem still occures, right? Then it is not an FFDec problem. Probably there is some code in your file which executes and fails when you change this flash. Btw: Is thins problem still exists?
I didn't tested it yet. I probably wrong described my problem. After changing the pushtrue to pushfalse, the whole flash file being broken. Main interesting thing is that the file size is changed, when only one byte been changed.
Please attach the swf. If your swf is compressed (starts with CWS or ZWS bytes) then it is normal that the size changes, because FFDec recompresses it. Uncopressed SWF file shouls start with FWS bytes.