Sangean WFT-1 (R1) - Manual (Page 26)

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Internet Software Upgrade
There are two mechanisms to upgrade the radio.
Upgrade via Internet
The main one, and the only one available though the menu system is
the Internet Software Upgrade. To access this feature:
1. Rotate and press the TUNING knob to navigate to the Software
upgrade option in the menu. The direction is:
Main Menu System setup Software upgrade
If there is a newer version of software available, the user will be asked
to confirm the upgrade. Once the process is initiated, a progress bar
will show in the display and a splash screen displayed periodically will
remind the user not to remove power. This is very important in order to
keep the radio operational. If the radio lost power during the upgrade,
it may restart automatically in USB upgrade mode.
Once the process completes, the user is presented with the result
(either upgrade successful or failed). If successful, pressing <select>
will restart the radio with the new software.
Note:
After a software upgrade all the user settings are preserved.