This is a solution to make the L298 motordriver working with 5V.
I bought several of them to be able to run servos without electronic board as a DC motor, which just work at 5V and did not find the right solution on the web.
You just have to bridge 5V from the VCC Input to the 5V Output.
It does not matter if the jumper for the internal 5V source is in place or not.
The red LED goes on and it works perfect.