[XPERIA X10 Android Development] ThJap:
You can rewite your prop see below

##### Merging of the /util/data/semc_kernel_time_stamp.prop file #####
ro.build.date= 05/08/2011
ro.build.display.id=ThGo2_(@_@)_v0.8.1a
ro.build.date.utc=1308515086
ro.build.user=SEMCUser
ro.build.host=SEMCHost

##### Final patch of properties #####
ro.semc.product.model=SO-01C
ro.build.product=SO-01C
ro.build.description=SO-01C-user 2.3.3 3.0.1.F.0.126 gS_P test-keys

ro.product.brand=SEMC
ro.product.name=SO-01C_1246-7916
ro.product.device=SO-01C
ro.build.tags=release-keys
ro.build.fingerprint=docomo/SO-01C_1246-7916/SO-01C:2.3.3/3.0.1.F.0.126/gS_P:user/release-keys

######################## Customized property values #########################

ro.semc.version.cust=1241-1846
ro.semc.version.cust_revision=R1C
ro.semc.enable.fast_dormancy=false
ro.semc.ecclist.num=3
ro.semc.ecclist.type.0=police
ro.semc.ecclist.number.0=999
ro.semc.ecclist.plmn.0=234 FFF
ro.semc.ecclist.type.1=police
ro.semc.ecclist.number.1=112
ro.semc.ecclist.type.2=police
ro.semc.ecclist.number.2=911
persist.ro.ril.sms_sync_sending=1
ro.telephony.nosim=false

#########################################################################

ro.config.ringtone=sony_ericsson.ogg
ro.config.notification_sound=notification.ogg
ro.config.alarm_alert=alarm.ogg
ro.semc.content.number=PA1

################# Updating of the SW Version #################
ro.semc.version.fs_revision=3.0.1.F.0.126
ro.build.id=3.0.1.F.0.126
ro.build.display.id=3.0.1.F.0.126

##### Values from product package metadata #####
ro.product.model=SO-01C
ro.semc.ms_type_id=AAD-3880098-CV
ro.semc.version.fs=DCM
ro.semc.product.name=SO-01C
ro.semc.product.device=LT15

# begin build properties
# autogenerated by buildinfo.sh
#ro.build.id=3.0.1.G.0.75
#ro.build.display.id=3.0.1.G.0.75
ro.build.version.incremental=tB_P
ro.build.version.sdk=10
ro.build.version.codename=REL
ro.build.version.release=2.3.3
#ro.build.date=Wed Jul 13 19:17:43 CEST 2011
#ro.build.date.utc=1310577463
ro.build.type=user
#ro.build.user=hudsonslave
#ro.build.host=seldlx1579
#ro.build.tags=test-keys
#ro.product.model=rachael
#ro.product.brand=Sony-Ericsson
#ro.product.name=rachael
#ro.product.device=rachael
ro.product.board=es209ra
ro.product.cpu.abi=armeabi-v7a
ro.product.cpu.abi2=armeabi
ro.product.manufacturer=Sony Ericsson
ro.product.locale.language=en
ro.product.locale.region=GB
ro.wifi.channels=
ro.board.platform=qsd8k
# ro.build.product is obsolete; use ro.product.device
#ro.build.product=rachael
# Do not try to parse ro.build.description or .fingerprint
#ro.build.description=rachael-user 2.3.3 3.0.1.G.0.75 tB_P test-keys
#ro.build.fingerprint=Sony-Ericsson/rachael/rachael:2.3.3/3.0.1.G.0.75/tB_P:user/test-keys
# end build properties
#
# system.prop for rachael
#

# Notify the system that the RIL only signals once
ro.telephony.call_ring.multiple=false

rild.libpath=/system/lib/libril-qc-1.so
rild.libargs=-d /dev/smd0
persist.rild.nitz_plmn=
persist.rild.nitz_long_ons_0=
persist.rild.nitz_long_ons_1=
persist.rild.nitz_long_ons_2=
persist.rild.nitz_long_ons_3=
persist.rild.nitz_short_ons_0=
persist.rild.nitz_short_ons_1=
persist.rild.nitz_short_ons_2=
persist.rild.nitz_short_ons_3=
DEVICE_PROVISIONED=1

wifi.interface = wlan0
ro.semc.wifi.hostapd=1

#ro.semc.product.name=Rachael
#ro.semc.product.device=Rachael
#ro.semc.product.model=Rachael

ro.semc.timescape_keys=Sony_Ericsson_Xperia

ro.semc.sols.product-code=83
ro.semc.sols.company-code=5
persist.ro.ril.sms_sync_sending=1

# Disable strict mode checking
persist.android.strictmode=0

# Constant values for Battery test in Service menu
ro.semc.batt.capacity=1500
ro.semc.batt.test.z_threshold=50
ro.semc.batt.test.min_level=70

ro.service.swiqi.supported=true
persist.service.swiqi.enable=1

ro.semc.automount.disabled=true

#Default values/Locales for the hiding languages feature
ro.product.locale.excluded=ar_EG ar_IL fa_IR iw_IL

ro.camera.hd_shrink_vf_enabled=1

#
# ADDITIONAL_BUILD_PROPERTIES
#
ro.product-res-path=framework/SemcGenericUxpRes.apk
#ro.config.notification_sound=OnTheHunt.ogg
#ro.config.alarm_alert=Alarm_Classic.ogg
ro.com.google.gmsversion=2.3_r3
ro.setupwizard.mode=DISABLED
ro.com.google.clientidbase=android-docomo-jp
persist.usb.storagemode=mtp
keyguard.no_require_sim=true
ro.com.android.dateformat=MM-dd-yyyy
ro.com.android.dataroaming=false
#ro.ril.hsxpa=1
#ro.ril.gprsclass=10
ro.sf.lcd_density=240
#dalvik.vm.heapsize=36m
net.bt.name=Android
dalvik.vm.stack-trace-file=/data/anr/traces.txt
ro.drm.active.num=4
ro.drm.active.0=semc,1
ro.drm.active.1=cmla,0
ro.drm.active.2=viaccess,0
ro.drm.active.3=marlin,1

# CUSTOM PROPERTIES
ro.sf.lcd_density=240
dalvik.vm.heapsize=36m
dalvik.vm.lockprof.threshold=300

# ADDITIONAL_BUILD_TWEAKS
windowsmgr.max_events_per_sec=250
mot.proximity.delay=100

wifi.supplicant_scan_interval=150
wifi.interface=wlan0
ro.telephony.call_ring.delay=1000
ro.mot.eri.losalert.delay=1000
ro.opengles.version=131072
debug.sf.hw=1

# GENERIC_TWEAKS
ro.default_usb_mode=2
ro.ril.disable.power.collapse=1

# TWEAKS_INTERNET
ro.ril.hep=1
ro.ril.enable.dtm=1
ro.ril.enable.a53=1
ro.ril.enable.3g.prefix=1

net.tcp.buffersize.default=4096,87380,256960,4096,16384,256960
net.tcp.buffersize.wifi=4095,87380,256960,4096,16384,256960
net.tcp.buffersize.umts=4094,87380,256960,4096,16384,256960
net.tcp.buffersize.edge=4093,262140,770880,4096,16384,256960
net.tcp.buffersize.gprs=4092,87380,256960,4096,16384,256960

net.dns1=8.8.8.8
net.dns2=8.8.4.4

# Th tweaks
ro.secure=0
#debug.gr.swapinterval=0
ro.semc.xloud.supported=true

ro.FOREGROUND_APP_ADJ=0
ro.VISIBLE_APP_ADJ=1
ro.PERCEPTIBLE_APP_ADJ=2
ro.HEAVY_WEIGHT_APP_ADJ=3
ro.SECONDARY_SERVER_ADJ=4
ro.BACKUP_APP_ADJ=5
ro.HOME_APP_ADJ=6
ro.HIDDEN_APP_MIN_ADJ=7
ro.EMPTY_APP_ADJ=15
ro.FOREGROUND_APP_MEM=1536
ro.VISIBLE_APP_MEM=2048
ro.PERCEPTIBLE_APP_MEM=4096
ro.HEAVY_WEIGHT_APP_MEM=20480
ro.SECONDARY_SERVER_MEM=8192
ro.BACKUP_APP_MEM=17920
ro.HOME_APP_MEM=40960
ro.HIDDEN_APP_MEM=15360
ro.EMPTY_APP_MEM=20480

# for JP
ro.semc.spn.currentname=NTT DoCoMo
ro.semc.spn.newname=NTT DoCoMo
ro.semc.push_email=1
ro.semc.supplementary_service=1
ro.config.libemoji=libemoji_docomo.so
ro.product.brand=docomo
ro.semc.ecclist.num=6
ro.semc.ecclist.type.0=firebrigade ambulance
ro.semc.ecclist.number.0=119
ro.semc.ecclist.plmn.0=440 FFF
ro.semc.ecclist.non_ecc.0=false
ro.semc.ecclist.type.1=firebrigade ambulance
ro.semc.ecclist.number.1=119
ro.semc.ecclist.plmn.1=441 FFF
ro.semc.ecclist.non_ecc.1=false
ro.semc.ecclist.type.2=marineguard
ro.semc.ecclist.number.2=118
ro.semc.ecclist.plmn.2=440 FFF
ro.semc.ecclist.non_ecc.2=false
ro.semc.ecclist.type.3=marineguard
ro.semc.ecclist.number.3=118
ro.semc.ecclist.plmn.3=441 FFF
ro.semc.ecclist.non_ecc.3=false
ro.semc.ecclist.type.4=police
ro.semc.ecclist.number.4=110
ro.semc.ecclist.plmn.4=440 FFF
ro.semc.ecclist.non_ecc.4=false
ro.semc.ecclist.type.5=police
ro.semc.ecclist.number.5=110
ro.semc.ecclist.plmn.5=441 FFF
ro.semc.ecclist.non_ecc.5=false
ro.voicemail.dialing-number=1417

ro.telephony.default_network=2
ro.ril.hsxpa=2
ro.ril.gprsclass=12
ro.ril.hsdpa.category=10
ro.ril.hsupa.category=6
ro.ril.oem.ecclist=110,118,119