The target of system ware version update is the controller whose 6th character of the build number is below on BO-IC400 or BO-IC400N.
For how to check the build number, refer to "2. How to check the firmware version".
To check the System Software version using, follow below procedure.
Confirm [Build number] by [Settings] - [About phone].
Although Epson has designed OS Update to prevent disturbing any existing files, there is always a chance that OS Update will cause the loss of your data stored in your device. Before conducting OS Update, please be sure to make a full backup of your data by copying it to an external hard drive or to your computer.
Please conduct OS Update at your own risk. EPSON SHALL NOT BE LIABLE TO YOU FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL OR EXEMPLARY DAMAGES THAT MAY BE INCURRED BY YOU IN CONNECTION WITH OS UPDATE, INCLUDING ANY LOSS OF DATA.
You can't downgrade to a previous software version after installing an update.
Note : Connect to a power supply, and run the update while the product is turned on.
When a system update is available, a notification is displayed at the top of the screen.
You can also check the update package from [Settings]. Select [Settings] from the APPS list, and then select [System] - [Advanced] - [System Updates].
Follow the on-screen instructions to download the update package.
If satisfy any of following conditions, it can start update. (Become active of [Start update])
The system reboots after completed update and finish the update process.