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Firmware update via USB:
Format a USB Stick to FAT32 and copy the firmware on to it (OCTAGON_SX88_FW_v1.04.xx.mupg).
Insert USB stick into the receiver.
Power on the receiver.
Go to the receivers Menu settings - Firmware update: OK Button (PIN 000) - Update method USB - Start red button
Wait until update is finished. Receiver will reboot by itself.
Online Update from the Internet:
Update Method Select update from the Internet and start with red button!