RC looks like in vegetative mode

[Zarthak]

Hello, i apologize in advance for my bag english.
Here is my problem : Yesterday i update my RC with the latest DJI GO 4 application (Android version, Galaxy s8+) but at 100% the application show me an error "Update failure"...
Since this message my RC is not visible in Wi Fi and i can't link it to my Spark.
When i try i only have a little BEEP and nothings happen.
Oh and the light is flashing red.

Thanks a lot,
Axel