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• To restore a Samsung SCX-3405 / SCX-3405W to the original (“di fabbrica”) configuration you have three progressively deeper procedures:
From the front-panel menu
Menu ➜ System Setup (Imposta sist.) ➜ Reset (Azzera imp.) ➜ All Settings (Tutte le imp.) ➜ OK ➜ the machine reboots.
Hardware (NVRAM) reset
Power OFF ⟶ keep Stop/Cancel pressed ⟶ connect mains ⟶ release when LEDs stop cycling.
This clears user memory even if the normal menu is inaccessible.
Service/Tech-mode reset (for printers blocked by firmware V3.00.02.05)
On the keypad: Menu → # → 1 → 9 → 3 → 4 → Menu ➜ Tech-Mode ➜ Data Setup / Clear All Mem or NVRAM Init ➜ OK ➜ reboot.
Key points
• Method 1 is safe and leaves firmware untouched.
• Method 2 adds an NVRAM clear (Wi-Fi, counters, language, date).
• Method 3 is hidden, needed only if the menu is missing or greyed-out.
• Firmware 3.00.02.05 may lock the printer; in that case only a firmware overwrite (“FIX” or downgrade) restores full operation.
Reset layers
a) Logical (menu) reset – stored in EEPROM, quick.
b) NVRAM clear – wipes volatile/backup RAM, removes corrupted tables, forces device to rebuild defaults at boot.
c) Firmware re-flash – replaces code in NAND/ROM; last resort when firmware actively blocks operations (e.g. anti-counterfeit update 3.00.02.05 issued by Samsung late-2019, now hosted by HP).
Typical symptoms requiring a deeper reset
• Front panel shows “Developer Error”, “Image Error”, or keeps rebooting.
• “System Setup ➜ Reset” menu item missing.
• Printer refuses non-OEM toner after December-2020 update.
Why firmware V3.00.02.05 is critical
• Adds CRUM (toner-chip) authentication every power-on.
• Removes some service-mode items to prevent end-user downgrade.
• Can set an internal “lock” bit if a clone chip is detected; only a firmware rewrite resets that bit.
Memory map (simplified)
• Main code: 8 MB NAND, write-protected except in “Download/Wait Image” mode.
• NVRAM: 32 kB serial flash – holds counters, Wi-Fi keys, etc.
• EEPROM: 1 kB on toner CRUM; not erased by any printer reset.
• HP (owner of Samsung printing division) withdrew most pre-2019 firmware from public sites; only the “secured” 3.xx stream is offered.
• Third-party “FIX” firmware images are still available (ereset, PrintHelp, EndlessInk) and generated per-serial-number.
• EU right-to-repair discussions (2023/24) push vendors to publish downgrade paths; none announced yet for SCX-3405.
• Market trend: small mono-laser devices now use cloud-based configuration (HP+, Xerox-Smart); local service menus are disappearing.
Hardware reset timing diagram
t0 t1 t2 t3
|----|-----------|------------------|
OFF AC applied Stop held LEDs cycle → releaset1-t2 ≥ 2 s guarantees PFC + DC-bus discharge; releasing at t3 re-initialises RAM.
Entering download (forced firmware) mode
• Power OFF → hold Stop/Cancel → Power ON → keep pressed 15 s → display “DOWNLOAD” or LED solid orange.
• Send *.hd image via usbprns2.exe: usbprns2.exe FIX_3405W.hd
• 19200 B/s transfer ≈ 6 min; the printer auto-reboots twice.
• Flashing non-official firmware voids warranty and may violate EULA.
• “Fix” images often bypass page/toner counters – this can infringe intellectual-property rights in certain jurisdictions.
• Ensure electrical safety: stagnant high voltage inside HVPS; unplug before board access.
• Personal-data risk: Wi-Fi credentials reside in NVRAM; reset erases them, preventing unintended disclosure if the device is resold.
Implementation sequence (recommended)
Common pitfalls & cures
• “Download-End” hangs → use different USB port, disable power-saving.
• Device ID unknown after flash → run NVRAM INIT again.
• Windows driver “SCX-3400 Series” lost → install HP-Universal-Print-Driver v7.1.2 (May 2024).
• There is no documented way to downgrade through the normal menu once 3.00.02.05 is installed; only Download-mode accepts an older image.
• A failed flash (power loss) bricks the main board – only JTAG recovery (unofficial) can revive it.
• Page counter and fuser life are stored in two places; NVRAM clear resets soft counter but not the fuser EEPROM.
• Monitor EU “Digital Product Passport” legislation – may oblige HP to provide unlock codes.
• Investigate open-source “samsung-mfp” driver: levels of counter reset available via USB control pipes.
• Explore Raspberry Pi-based firmware flasher to automate fleet maintenance.
• Study ISO/IEC 11798 for long-term document durability if you plan archival printing.
A Samsung SCX-3405 can be returned to factory defaults by:
Choose the lightest method that solves the issue, back up configuration first, and apply firmware flashing only when mandatory, acknowledging the legal and technical risks involved.