su

mount -o remount,rw -t yaffs2 /dev/block/mtdblock1 /system

cat /sdcard/flash_image > /system/bin/flash_image

chmod 755 /system/bin/flash_image

mv /system/etc/install-recovery.sh /system/etc/install-recovery.sh.bak

mount -o remount,ro -t yaffs2 /dev/block/mtdblock1 /system

flash_image recovery /sdcard/recovery-RA-GNM-thunderg-1.1.0.img

reboot recovery