Hi Jean-Christophe,
You probably can not reset the error code because the problem is not fixed yet.
The
Tech sheet is pretty straight with the troubleshooting for the E57 error code. Test 9 says:"If the readings (motor windings) are correct, replace the speed control board". So, the next step is to replace the speed control board.
- The motor speed control board
Part number: 134743500 
Here are the breakdown diagrams and
Parts for Frigidaire ATF7000FE1 Washer - AppliancePartsPros.com
Gene.