[Samsung Galaxy Mini] Svennen:
I've solved it, I installed build.prop editor and edited the backup. Thats the easiest way.

This is my first try:

# begin build properties
# autogenerated by buildinfo.sh
ro.build.id=GWK74
ro.build.display.id=GWK74
ro.build.version.incremental=eng.ktux.20120409.134647
ro.build.version.sdk=10
ro.build.version.codename=REL
ro.build.version.release=2.3.7
ro.build.date=Mon Apr 9 13:47:29 ICT 2012
ro.build.date.utc=0
ro.build.type=user
ro.build.user=ktux
ro.build.host=kittenlinuxhd
ro.build.tags=test-keys
ro.product.model=GT-S5570
ro.product.brand=samsung
ro.product.name=GT-S5570
ro.product.device=GT-S5570
ro.product.board=tass
ro.product.cpu.abi=armeabi
ro.product.manufacturer=samsung
ro.product.locale.language=swe
ro.product.locale.region=SWE
ro.wifi.channels=
ro.board.platform=msm7k
# ro.build.product is obsolete; use ro.product.device
ro.build.product=GT-S5570
# Do not try to parse ro.build.description or .fingerprint
ro.build.description=GT-S5570-user 2.3.6 GINGERBREAD XWKTN release-keys
ro.build.fingerprint=samsung/GT-S5570/GT-S5570:2.3.6/GINGERBREAD/XWKTN:user/release-keys
ro.cm.device=tass
# end build properties
# tweaks
DEVICE_PROVISIONED=1
debug.sf.hw=1
debug.composition.type=mdp
ro.sf.lcd_density=160
qemu.sf.lcd_density=120
ro.opengles.version = 131072
dalvik.vm.execution-mode=int:jit
windowsmgr.max_events_per_sec=150
debug.performance.tuning=1
video.accelerate.hw=1
media.stagefright.enable-player=true
dalvik.vm.verify-bytecode=false
dalvik.vm.dexopt-flags=m=v,o=y
dalvik.vm.dexopt-data-only=1
ro.telephony.call_ring.delay=0
mot.proximity.delay=25
persist.sys.purgeable_assets=1
persist.android.strictmode=0
persist.sys.scrollingcache=2
pm.sleep_mode=1
ro.ril.disable.power.collapse=1
ro.min_pointer_dur=1

# video - photo rec tweaks
ro.media.dec.jpeg.memcap=8000000
ro.media.enc.hprof.vid.bps=8000000

#data 3g tweaks
ro.ril.hsxpa=2
ro.ril.gprsclass=10
ro.ril.hep=1
ro.ril.enable.dtm=1
ro.ril.hsdpa.category=12
ro.ril.enable.a53=1
ro.ril.enable.3g.prefix=1
ro.ril.htcmaskw1.bitmask=4294967295
ro.ril.htcmaskw1=14449
ro.ril.hsupa.category=6

net.tcp.buffersize.default=4096,87380,256960,4096, 16384,256960
net.tcp.buffersize.wifi=4096,87380,256960,4096,163 84,256960
net.tcp.buffersize.umts=4096,87380,256960,4096,163 84,256960
net.tcp.buffersize.gprs=4096,87380,256960,4096,163 84,256960
net.tcp.buffersize.edge=4096,87380,256960,4096,163 84,256960

media.stagefright.enable-player=true
media.stagefright.enable-meta=true
media.stagefright.enable-scan=true
media.stagefright.enable-http=true
media.stagefright.enable-record=false

#
# ADDITIONAL_BUILD_PROPERTIES
#
ro.com.google.locationfeatures=1
ro.com.google.networklocation=1
dalvik.vm.checkjni=false
rild.libargs=-d/dev/smd0
rild.libpath=/system/lib/libsec-ril.so
ro.telephony.ril_class=samsung
ro.telephony.sends_barcount=1
mobiledata.interfaces=pdp0,wlan0,gprs,ppp0
wifi.interface=wlan0
wifi.supplicant_scan_interval=180
dalvik.vm.heapsize=64m
persist.sys.purgeable_assets=1
persist.sys.use_dithering=1
ro.media.dec.jpeg.memcap=20000000
ro.opengles.version=131072
ro.sf.lcd_density=160
ro.compcache.default=0
keyguard.no_require_sim=true
ro.rommanager.developerid=cyanogenmod
ro.url.legal=http://www.google.com/intl/%s/mobile/android/basic/phone-legal.html
ro.url.legal.android_privacy=http://www.google.com/intl/%s/mobile/android/basic/privacy.html
ro.com.google.clientidbase=android-google
ro.com.android.wifi-watchlist=GoogleGuest
ro.setupwizard.enterprise_mode=1
ro.com.android.dateformat=MM-dd-yyyy
ro.com.android.dataroaming=false
ro.config.ringtone=Playa.ogg
ro.config.notification_sound=regulus.ogg
ro.config.alarm_alert=Alarm_Beep_03.ogg
ro.modversion=CyanogenMod-7.2.0-RC1-tass-UNOFFICIAL
ro.setupwizard.mode=OPTIONAL
net.bt.name=Android
dalvik.vm.stack-trace-file=/data/anr/traces.txt
dalvik.vm.dexopt-data-only=1