...See my responses in red and bold color. Why to you need to make the firmware update using fullflash? If you try to fullflash (using Joker) with the fullflash for other flash chip, automatically Joker give message and if continue, destroyed flash blocks. After this, you need to fullflash again...
Is better to make only firmware upgrade...
Go to the landy site http://eh.student.utwente.nl/~landy/index.php?dir=C60_C60A/
user: mobile
password: elibom
and download firmware 27 with your country language pack C60_27-LG-00.
LG01: English, Nederland, Arabic, French, German, Italian, Turkish
LG02: English, German, Danish, Norwegian, Swedish, Finnish
LG03: English, Czech, German, Polish, Slovakian, Hungarian
LG04: English, Bulgarian, Greek, Romanian, Russian, Turkish
LG05: English, Catalan, French, German, Portuguese, Portuguese(for Brazil), Spanish
LG06: English, Croatian, French, German, Italian, Serbian, Slovenian
LG07: English, Hindi, Indonesian, Malaysian, Tagalog, Thai, Vietnamese
LG90: English, Arabic, French, German, Hebrew, Italian, Russian
LG91: English, Estonian, Latvian, Lithuanian, Polish, Russian, Ukrainian
LG92: English, Arabic, Farsi, Hindi, Malayalam, Tagalog, Urdu
LG95: English, English(US), French(for Canada), Spanish(Mexican)
Use any data cable (not service cable) to make the firmware upgrase. Is easy and safe...
That is,
dagos