Do you try this:
1 -> Put the update_kernel on the root of the sd card
2 -> Switch on your Opus
3 -> Insert the SD card, the SD logo should appear, if not retry to insert
4 -> Shutdown your Opus
5 -> Restart your opus with the center button press until the update process start.
This procedure generaly have good results.
If the SD card show on the library, then restart the device, you have more than 90% of chance that the update will start correctly
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