Once you’ve fixed the "cheat engine scan error thread 0 please fill something in 100 upd" issue, adopt these best practices:
Some open-world games or emulators (like Yuzu, Ryujinx, or PCSX2) allocate and deallocate memory thousands of times per second. When Cheat Engine scans, it can't lock Thread 0 fast enough. After roughly 100 update attempts, the scanner declares the thread dead.
Cheat Engine attempts to scan every type of memory region. Some regions (mapped files, images) have no "updates" to fill.
This filters out dead memory regions that cause Thread 0 to wait for updates that never arrive.
This is a UI/validation warning. It typically occurs when:
cheat engine scan error thread 0 please fill something in 100 upd
Open Command Prompt as Administrator.
Navigate to Cheat Engine’s installation folder (C:\Program Files\Cheat Engine 7.x).
Run:
CEWinDrv.exe /uninstall
CEWinDrv.exe /install
Then restart Cheat Engine. This fixes driver-level attachment issues causing Thread 0 failure. Once you’ve fixed the "cheat engine scan error
Note: Always be careful when scanning memory. Ensure you have permission to modify the software you are using Cheat Engine on, as using it in online games or competitive environments can lead to account bans.
The error message "Scan error: thread 0: [Value] is an invalid value" or "Scan error: thread 0: access violation" typically occurs when Cheat Engine
(CE) cannot properly access the game's memory or the temporary scan files it creates. Quick Fixes for Thread 0 Errors
Run as Administrator: Right-click the Cheat Engine executable and select Run as Administrator to ensure it has permission to read/write to other processes.
Check Disk Space: Ensure you have at least 500MB of free space on the drive where Cheat Engine is installed. CE creates massive temporary files during scans; if the drive is full, the scan thread will fail immediately.
Disable Antivirus/Firewall: Tools like Windows Defender or third-party suites (e.g., Comodo) often flag CE’s memory-reading behavior as malicious. Add an exclusion for the Cheat Engine folder.
Toggle MEM_MAPPED: Go to Settings > Scan Settings and try checking (or unchecking) MEM_MAPPED. For some games, having this enabled causes an "Access Violation" on specific threads. Troubleshooting "Please Fill Something In" (Error 100) This filters out dead memory regions that cause
This specific prompt usually appears when a scan field is empty or contains characters that don't match the selected Value Type.
The "Scan error: thread 0" message in Cheat Engine typically points to a failure in accessing the temporary files or memory segments required to process your scan. While the "please fill something in 100 upd" part of your query appears to be a specific or slightly garbled instruction, the underlying error is a well-known technical hurdle for users. Understanding "Thread 0" Scan Errors
In Cheat Engine, "Thread 0" refers to the primary execution thread responsible for the scanning process. When this thread fails, it is usually because the software has lost its "grip" on the target data. This can happen for several reasons:
Permission Denied: Cheat Engine often lacks the necessary administrative rights to read or write to its own temporary scan folder or the target game's memory.
Disk Space Exhaustion: Large scans—especially those for the value "0" or "Unknown Initial Value"—create massive temporary files. If your drive has less than 500MB to 20GB of free space (depending on the game size), the scan thread will crash.
Anti-Virus Interference: Security software like Comodo or Windows Defender may flag the memory-reading behavior as malicious, terminating the thread to "protect" the system.
Corrupt Scan Files: If a previous scan was interrupted, the existing temporary files in your Cheat Engine directory might be locked or corrupted. Technical Fixes for the Thread 0 Error cheat engine scan error thread 0 please fill
To resolve this, you must ensure Cheat Engine has a clean, unobstructed environment to work in.
Run as Administrator: Right-click the Cheat Engine executable and select Run as Administrator to ensure it has elevated privileges to access protected memory regions.
Clear Disk Space: Ensure your primary drive (where Cheat Engine is installed) has significant free space. For heavy scans, experts at the Cheat Engine Forum recommend at least 20GB to 80GB of free space to avoid stream write errors.
Change Scan File Location: Go to Settings > Scan Settings and check the box to set a custom path for temporary scan files. Point this to a folder on a drive with plenty of space that is not "Read Only" or protected by the system.
Check Memory Settings: In some cases, enabling MEM_MAPPED in the Scan Settings can help Cheat Engine see memory that is otherwise hidden, preventing certain "no readable memory" or "access violation" errors.
Disable Anti-Cheat and Firewalls: If you are trying to scan a game with active protection (like Easy Anti-Cheat or Vanguard), the scan thread will be blocked. Ensure you are testing on a program without these protections or that you have successfully bypassed them.
By addressing these file-system and permission issues, you allow "Thread 0" to complete its task of mapping the game's memory, moving you past the error and toward your successful scan.
Have you checked your available disk space or tried running the 64-bit version of Cheat Engine to see if the error persists?
Cheat Engine :: View topic - Scan error:thread 0:Stream read error