User manual

MediaTek LinkIt™ Smart 7688 Developer's Guide

Page 48

This document contains information that is proprietary to MediaTek Inc.

Unauthorized reproduction or disclosure of this information in whole or in part is strictly prohibited.

4.6.2. Upgrading boot loader

Warning:

Do not disconnect the power source or unplug the USB drive during boot loader upgrading

process, or else the data in flash will be damaged and the device will fail to boot up again.

This section describes how to upgrade the boot loader.

Please follow these steps:

1) Save the boot loader file (lks7688.ldr) in the root directory of a USB drive and name it

lks7688.ldr, you can download the latest boot loader from MediaTek Labs website.

2) Plug the USB drive to LinkIt Smart 7688.

3) Press the Wi-Fi and MPU (Reset) button at the same time, then release the MPU Reset

button but hold the Wi-Fi button for at least 20 seconds (after 20s Wi-Fi LED will turn on)

and release.

4) LinkIt Smart 7688 development board will start to read the boot loader (Wi-Fi LED blinks

fast) and perform the boot loader upgrade process (Wi-Fi LED blinks slowly). It takes about

2 seconds to finish the boot loader upgrade process.

4.6.3. Wi-Fi Reset

Press the Wi-Fi Reset button for at least 5 seconds and release. The device will go into AP mode.

4.6.4. Factory Reset

This section describes how to do factory reset on LinkIt Smart 7688 development board. Factory

reset will erase all user data from the board, so proceed with caution. Choose from one of the

following two ways to perform factory reset.

• Using Web UI

1) Sign in the Web UI, refer to section 4.5.3, “Connecting to the Web UI”, under Factory reset,

click RESET, as shown in Figure 28.

Figure 28 Factory Reset using LinkIt Smart 7688 Web UI

• Using the Wi-Fi Reset button

After LinkIt Smart 7688 is boot up (power LED solid on, Wi-Fi LED), press the Wi-Fi Reset button

for at least 20 seconds and release. Please see

Figure 3 and Figure 9 for Wi-Fi Reset button

locations. LinkIt Smart 7688 development board will reboot to default settings and all user data

will be eliminated from the board, so proceed with caution.