SU760 i need help

my brother buy SU760 network wasnt good
its characteristics was that i wrote
LG SU760
2.3.5
L6260_MODEM_SIC_01.1042.00
2.6.35.7
KING 36.
LG P920-V21A-NOV-15-2011
i thougt it maybe from flashing and flash the phone
with LG FLASH TOOL 1.2.45.921 to
BIN_LGP920AT-00-V20c-BAL-XXX-MAR-27-2012-0
flashing was succesfull but network come worse than before
and SD card is damaged not reading SD card
i flashed to
BIN_LGP920AT-00-V21a-EUR-XXX-NOV-15-2011-0
now no change at network very bad
sd card not reading
now this time DAMAGED PHONE MEMORY is added
i wanted to flash
XBSA V21E P920 & V20F SU760 "ICS Themed" V2
ROOT and CWM are done
but now i cant copy
China_V20F_SU760 (2).zip and UOT-05-23-14-58-2.zip to
INTERNAL SD card
please help i have to solve problem
now phones characteristics are like that
LG-P920
2.3.5
L6260_MODEM_SIC_01.1042.00
2.6.35.7+
GRJ90
LGP920-V21A-NOV-15-2011
THANKS

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