Peugeot 3008 ok, car not starting after a new battery 100% charged put in. states brakes faulty and wont start engine. it's a common problem it as i see it written everywhere.

This is a common problem.
I checked on Youtube and found 2 videos of a fix. The problem is the mechanic is east European and I can't understand him. So, the electrics and fuses on top of the battery, like a strange terminal that you remove to get to the battery. Well, the right part is not getting power, so when you link a wire from right to the left, it bridges the gap and you can start the car, and the brakes go to normal, including the gearbox. Everything looks good. However, when you stop the engine a red warning circle with the exclamation mark comes on. I removed the bridging wire, following the 3-minute rule, but the car went back to fault mode.
The battery is not the problem, it could be something on the electrical router on top of the battery needs replacing, or another method to send the power through properly needs to be used.

I am hoping there is a car electrician here that can explain this better.