Hold down the OK button (or the dedicated "Update" button, depending on your revision) on the T700X’s touch panel or rotary controller. While holding the button, turn on the main power.
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Turn off your Handy T700X using the main power switch. Wait 10 seconds for the capacitors to discharge. Hold down the OK button (or the dedicated
Plug the prepared USB drive into the USB Host port on the T700X’s control box. This is usually a full-size USB-A port labeled "UPDATE" or "HOST." Turn off your Handy T700X using the main power switch
Download the latest portable firmware package. Extract the contents if necessary. You should see a file named similar to T700X_Portable_FW_v2.1.4.bin . Copy this file directly to the root directory of the USB drive. Do not place it inside any folders.