I have the VIM3L HTPC Kit (SKU: KVIM3-L-005) and I’m not able to have it boot into USB upgrade mode.
I’ve tried the steps from:
Quickly press the F button 3 times in 2 seconds, then release the button.
You will see the Power-LED (Blue) blink for about 3 seconds. After the Power-LED (Blue) turns OFF, this indicates that the board is in Upgrade Mode
But it doesn’t work; it always boots into “CoreELEC” software.
SOLUTION: DO NOT connect HDMI output to a receiver/TV when attempting to enter USB upgrade mode. USB upgrade mode will NOT work when HDMI output is connected to receiver/TV. It will always boot into CoreELEC. Only connect Power/USB to VIM3L when attempting to enter USB upgrade mode. With only Power/USB connected, press Function key 3 times and it should enter the USB upgrade mode (verified using the Windows Amlogic USB Burn Tool v2.2.0 detect the connected device as “HUB1-2” Status “Connect success”).