Then, open a shell to your phone via 'adb shell', get root, and do the following two commands to flash your new boot image:
# /system/bin/cat /sdcard/flash_image > /system/bin/flash_image
# /system/bin/chmod 755 /system/bin/flash_image
# /system/bin/cat /dev/mtd/mtd2 > /sdcard/mtd2.img
# /system/bin/cat /dev/zero > /dev/mtd/mtd2
write: No space left on device [this is ok, you can ignore]
# /system/bin/flash_image boot /sdcard/boot.img
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