OOWOW is an embedded service (integrated into your device) - it can be run at any time if you need to perform essential maintenance services on your device.

VIM4 is the first device from Khadas that includes the OOWOW embedded service. Since VIM4 comes without any pre-installed OS, users can use OOWOW to select and install their preferred OS.

OOWOW provides rapid online OS download and installation, which will improve quality of life for single board computer users - with OOWOW, you can install / reinstall your preferred OS in just 2-3 minutes.

The OOWOW wizard will guide you to install a new OS in just 4 steps, and it automatically starts if your device storage is empty.

• Connect to internet over Wi-Fi or Ethernet
• Display OS images for your device
• Select OS installation image
• Download and install OS into your device

Wizard Usage Example: https://dl.khadas.com/.temp/oowow/screencast/quick-start/-gallery?play=loop

• Install / reinstall OS
• Download online OS images
• Backup and restore system
• Display full device information
• Configure device
• Device hardware testing
• Online script collection
• Rescue shell
• Developer and advanced features

You can use the three physical buttons on your device to interact directly with the OOWOW system, we will describe them in more detail within the next section.

• RESET - reset device
• FUNCTION - multi functions
• POWER - multi functions

• Boot OOWOW - hold FUNCTION and short press RESET then release FUNCTION
• Toggle Easy Wi-Fi - short press POWER button
• Toggle Hotspot - short press FUNCTION button
• Accept Hotspot client - short press POWER button
• Power off - Long press the POWER button until device shuts down
• Enter multifunction mode - press and hold FUNCTION button (loop cycle: Hotspot → Firewall Allow → Firewall Block → Cancel, each mode wait 2 sec ), release to activate selected function

• Eject your TF card before booting OOWOW (TF card has highest priority)
• Boot OOWOW from sleep: hold FUNCTION button + short press RESET button + release FUNCTION button
• Boot OOWOW with power cable: hold FUNCTION button + plug power cable

Most system events have corresponding LED indications:

• Device starts or reboots: White solid
• Device power off: Red solid
• System start in default mode: White heartbeat
• Network connected: White solid
• Hotspot mode activated: White fast blinking
• Hotspot mode ready: White solid
• Hotspot client pending: White and red blinking
• Hotspot client accepted: White slow blinking
• Hotspot mode deactivated: White heartbeat
• Easy Wi-Fi activated: White blinking
• Easy Wi-Fi awaits connection: White slow blinking
• Easy Wi-Fi deactivated: White heartbeat
• Firewall block incoming: Red breathing
• Firewall allow incoming: White solid, red off
• Firewall disabled: Red blinking
• Image installation progress: Red & white blinking
• Image installation done: White solid, red off

Multifunctional modes:

• Hotspot: White off
• Firewall block incoming: White solid, red off
• Firewall allow incoming: White & red solid
• Cancel: White blinking

OOWOW provides a universal user interface (terminal mode menu + top status line) for HDMI, WEB, SSH, Serial-UART, etc (all interfaces work simultaneously)

• Keys: 0-9 A-Z ⇦ ⇨ ⇧ ⇩ Space Enter Esc Tab
• Mouse: select menu items and press buttons

A HDMI screen and keyboard is the primary interface modality.

Examples:

• http://DEVICE_IP or http://DEVICE_HOST_NAME - device page
• http://vim4-xxxxx.local/x/ - welcome page
• http://vim4-xxxxx.local/x/control - main menu

• Keys: 0-9 A-Z Space Enter
• Touchscreen: select menu items and press buttons
• Some virtual keyboard have additional keys: ⇦ ⇨ ⇧ ⇩ Esc Tab

• root access works by default without password
• ssh root@vim4-xxxxx.local - plain shell
• ssh root@vim4-xxxxx.local system - main menu

For developers and advanced users only.

• Check documentation to setup the serial debug tool
• root access works by default without password
• system - main menu

For developers and advanced users only.

Network connection is required for:

• OS downloading and installation
• OOWOW system updates
• Dynamic syncing of online scripts
• Remote control over LAN and WLAN

Every OOWOW device can be accessed remotely via its unique LAN name.

device-xxxxx:

• device: lowercase device name, e.g. VIM4 → vim4
• xxxxx: last 5 digits of the device serial number

Network name examples:

• vim4-00010
• vim4-00012
• vim3-12333

Depends on your LAN configuration, for example:

• vim4-00010 - dns resolver
• vim4-00010.local - umdns resolving - canonical variant for OOWOW
• …

# ping vim4-05690
PING vim4-05690 (192.168.30.203) 56(84) bytes of data.
64 bytes from 192.168.30.203 (192.168.30.203): icmp_seq=1 ttl=64 time=37.3 ms
 
# ping -c1 vim4-05690.local
PING vim4-05690.local (192.168.30.203) 56(84) bytes of data.
64 bytes from 192.168.30.203 (192.168.30.203): icmp_seq=1 ttl=64 time=37.3 ms
 
# curl http://vim4-05690.local
# curl http://192.168.30.203
# curl 192.168.30.203
# ssh root@vim4-05690
# ssh root@vim4-05690.local

Ethernet works automatically; just plug in an ethernet cable from your router.

User can setup and configure a WLAN connection Network → Wi-Fi → Wi-Fi Select Connection.

In cases wherein you are unable to configure a WLAN or LAN connection locally on your device, you can share your internet connection from a mobile device (e.g. smartphone) to your single board computer using the Easy Wi-Fi mode.

You can enable the Easy Wi-Fi mode on your device in two ways:

• Toggle Easy Wi-Fi - short press POWER button
• *Network → Wi-Fi → Easy Wi-Fi oowow > Enable / Disable*

Setup a new hotspot from your mobile device with the following configuration:

• SSID: oowow
• Password: 12345678

Once OOWOW is in the Easy Wi-Fi mode, it will automatically scan and connect to your Wi-Fi hotspot generated by your mobile device.

You can enable the OOWOW hotspot feature in two ways:

• Toggle hotspot - short press FUNCTION button
• *Network → Hotspot → Hotspot Enable / Disable*

The OOWOW hotspot will have the following configuration:

• SSID: vim4-xxxxx ( xxxxx - last 5 digits from device serial number )
• Password: 12345678

These hostnames can be used for device access via the hotspot:

• http://172.23.0.1
• http://oowow or http://oowow.local - works only for hotspot network
• http://vim4-xxxxx or http://vim4-xxxxx.local

*Network → Hotspot → Hotspot QR code.*

• *Network → Hotspot → Device Web Access QR code*
• *Network → Wi-Fi → Device Web Access QR code*

Connect your device directly to your computer using a USB cable. This feature will interest developers or advanced users; there is only a peer-to-peer network connection, no internet packets will be forwarded to your device.

*Network → Firewall Mode:*

• block - Block all incoming connections SECURE
• allow - Allow incoming connections from local networks RECOMMENDED
• disabled - Allow all connections, firewall disabled DANGER

Check here.

Check here.

Check here.

Check [here](http://dl.khadas.com/.temp/oowow/screencast/hotspot-mode/-gallery).

Internet access provided by LAN ethernet cable, user device access provided by WLAN hotspot.

Internet access provided by WLAN wifi-connection and user device access provided by WLAN hotspot same time.

TODO.

• OOWOW works only by user demand, and never works in the background
• OOWOW never sends any private data from your device to the internet
• By default, remote access to your device is blocked by the firewall

• Unicode international symbols don’t display properly for HDMI (Wi-Fi network names)
• IPV6 disabled at this time

• Automatically looks for updates when internet is connected, user will be notified if new updates need to be applied
• System updates must be manually approved by the user
• Don't turn off computer - during update

Check here for oowow system images.

• vim4-oowow-latest-sd.img.gz - latest oowow image for SD-card or USB-thumb drive
• vim4-oowow-latest-spi.img.gz - latest oowow image for SPI-flash
• vim4-oowow-latest-spi-upgrade-sd.img.gz - upgrade oowow SPI-flash firmware from SD-card

• vim4-oowow-latest-sd.img.gz → versions/vim4/vim4-oowow-VERSION-sd.img.gz

Download images using command line:

• curl -JOL https://dl.khadas.com/products/vim4/firmware/oowow/system/vim4-oowow-latest-sd.img.gz
• wget –content-disposition https://dl.khadas.com/products/vim4/firmware/oowow/system/vim4-oowow-latest-sd.img.gz

The process of new OS Installation is the biggest headache for users of single board computers (SBC); before installing an OS, users must read tons of manuals, trawl through online forums, learn how to install/reinstall using their desktop/laptop PC, learn where to find proper images etc…If something goes wrong it is possible to “BRICK” (destroy) your device(even through we can use TST mode to recovery rhe device).

In other words, any form of device upgrade, maintenance, or OS reinstallation requires advanced skills and external hardware, and this is out of reach for the average user, or users in regions without desktop/laptop PCs. With OOWOW your SBC becomes a standalone device; perform all maintenance functions and OS installation directly from the device itself.

OOWOW understands the end user deeply; it provides an out-of the-box, universal OS delivery and device configuration solution for all SBCs in the market today and into the future.

Live life easily with OOWOW!

oowow - infinity level wow (will be a new 77th word in the English dictionary).

• Pronunciation: /uː/ + /wau/ = /u:wau/
• Variations: ∞wow, infinity wow, endless wow