Fix Generator V 1 1 Samsung Scx 3405 -

The Samsung SCX-3405 Fix Generator v1.1 is a third-party software tool used to create custom modified firmware (known as "fix" firmware) that allows the printer to operate without the need for a toner cartridge chip. This process, often referred to as "resofting," enables users to refill toner cartridges or use cheaper non-original cartridges without the printer locking out due to "toner low" or "toner empty" errors. How the Fix Generator Works

The generator requires three specific identifiers from your printer to create a unique fix file:

Serial Number (SN): Located on the back of the printer or found in the Configuration Report.

Firmware Version: Must be compatible with the v1.1 generator (e.g., versions like V3.00.01.10 or lower).

CRUM Number: A unique 11-digit serial number for the toner cartridge chip, found in the Supplies Information report. Step-by-Step Usage Guide Print Reports: fix generator v 1 1 samsung scx 3405

Configuration Report: Hold the STOP/CLEAR button for about 4–5 seconds until the LED flashes once, then release.

Supplies Information: Hold the STOP/CLEAR button for approximately 15 seconds until the LED stays solid green, then release.

Generate the File: Enter the Serial Number, Firmware Version, and CRUM into the generator to create two files: a downloader (usbprns2.exe) and the fix firmware (.hd or .fls file).

Enter Download Mode: Turn the printer off. Hold the STOP/CLEAR button and press the POWER button. The screen should show "Wait Image" or "Download Mode". The Samsung SCX-3405 Fix Generator v1

Flash Firmware: Drag the fix firmware file onto the downloader executable while the printer is connected via USB. The printer LED will flash orange/green during the 3–5 minute process; do not power it off.

Finalize: Once the printer reboots, cover the toner chip with tape or remove it entirely. The printer should now show 100% toner indefinitely. Troubleshooting Tips

"Tech Mode" for Locked Printers: If your cartridge is at 0% and won't let you print reports, use the Tech Mode sequence: + + STOP - - STOP STOP. Navigate to UC, then AA, and press START twice.

Connection Errors: Ensure you use a high-quality USB cable and disconnect all other printers before flashing. Void Warranty: This process voids any remaining warranty

Recovery: If the update fails and the printer won't turn on, try a hard reset by unplugging it for 10 minutes or using official recovery tools from the HP Support site.

2. Prerequisites & Safety Warnings (Crucial)

Before attempting to use this tool, you must understand the risks:

Void Warranty: This process voids any remaining warranty.
Risk of "Bricking": If the USB connection is interrupted during the firmware flash, or if you use the wrong version file, the printer may become permanently unusable (a "brick").
Windows OS Requirement: These tools are almost always designed to run on Windows (usually Windows 7, 8, or 10 in "Test Mode" to bypass driver signature enforcement).
Check Version Compatibility: The SCX-3405 has different firmware versions (e.g., v3.00.02, v3.00.01). You generally cannot flash an older firmware version over a newer one. If your printer already has firmware v3.00.02, you usually cannot use a patch designed for v3.00.01.

5. Alternative: Hardware Reset Chips (CRUM)

If the Fix Generator software does not work (often due to firmware versions being too new), the most reliable hardware solution is replacing the CRUM Chip.

When you refill your toner, simply buy a replacement chip (costs approx. $2–$5).
These chips are auto-resetting or replacement counters.
This requires no software hacking and is much safer for the printer's mainboard.

5. Step-by-Step Implementation (Condensed)

Power off printer, disconnect AC.
Locate SPI flash (U504) on mainboard.
Connect programmer to flash pins (CS, MOSI, MISO, SCK, GND, VCC – 3.3V).
Read original dump (backup to original.bin).
Run fix_generator_v1.1.exe -i original.bin -o patched.bin.
Write patched.bin to flash.
Reassemble and power on.

Warning: Incorrect wiring or voltage (5V instead of 3.3V) will destroy the mainboard.

Step 5: Restart and Test

Restart Printer: After the patch is applied, restart your printer.
Test Printer: Perform a test print or scan to ensure that the issues have been resolved.