1. Power off the 412U.

2. Remove the ALL HDDs

3. Power on the 412U without any HDDs attached

4. After a short beep and a long beep,Run QNAP Finder, it will find the 412U. Note: Do not re-initialize when the QNAP Finder prompt a message, if you have some useful data in the disk

5. Plug all HDDs back into the 412U in correct order (1-2-3-4) original order. push in till the previous HDD led flashes constantly green.(Not Blinking)

6. Connect to the 412U by SSH port 22 and login as admin password admin

7. Issue the commands to update firmware.

# config_util 1
# storage_boot_init 1
# storage_boot_init 2
# config_util 4
# mount /dev/sda4 /mnt/ext
# cd /share/HDA_DATA/Public
# rm TS*
# /mnt/ext/usr/bin/wget http://eu1.qnap.com/Storage/TS-412U_20140612-4.1.0.zip
# unzip TS-412U_20140612-4.1.0.zip
# mkdir /mnt/HDA_ROOT/update
# ln -sf /mnt/HDA_ROOT/update /mnt/update
# /etc/init.d/update.sh TS-412U_20140612-4.1.0.img
# reboot