android - how to execute app as system user? -

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i want write in /sys/class/camera/rear_flash don't have permissions, file has read , write permissions user "system" , user within group "radio" (rw- rw- r--). can launch app "system" user or user within "radio" group without being root?

to run app system have install follow:

copy apk in sd card , executing these adb commands

adb shell su  cd sdcard/ mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system cat yourapp.apk > /system/app/yourapp.apk   chmod 644 /system/app/yourapp.apk reboot

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