Applying custom firmware resets can void your manufacturer's warranty. Always ensure you are using reputable tools like those found on or official Samsung/HP updates if you prefer to stay within official channels. reputable sources to download the official firmware for your SCX-3405? Samsung SCX-3405 Laser Multifunction Printer series
The toner level counter resets to 100% every time the printer is turned off and back on. Cost Reduction: fix generator v 1 1 samsung scx 3405
If you have already tried a fix and the printer is erroring out: Applying custom firmware resets can void your manufacturer's