If firmware update is unsuccessful, you can throw printer.
I recommend you build yourself a very simple "reset device" (resetter) for many models including this one. Address is,
http://www.tradebit.com/filedetail.php/178510406-at88sc0204-reset-software-full-package
List of chips that can be reset is,
Samsung ML-1630
Samsung ML-1631
Samsung ML-2850
Samsung ML-2851
Samsung ML-3050
Samsung ML-3051
Samsung ML-3470
Samsung ML-3471
Samsung ML-3472
Samsung ML-4050
Samsung ML-4550
Samsung ML-4551
Samsung SCX-4500
Samsung SCX-4501
Samsung SCX-4725
Samsung SCX-5330
Samsung SCX-5525
Samsung SCX-5530
Samsung CF-560
Samsung CF-565
Samsung SF-560
Samsung SF-565
Samsung CLP-350 (Bl/M/C/Y)
Samsung CLP-351 (Bl/M/C/Y)
Samsung CLP-610 (Bl/M/C/Y)
Samsung CLP-660 (Bl/M/C/Y)
Samsung CLX-6200 (Bl/M/C/Y)
Samsung CLX-6210 (Bl/M/C/Y)
Samsung CLX-6240 (Bl/M/C/Y)
...and many others.
Excuse my poor English.
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