Guys, i managed to start it. I rechecked (disconnected and reconnected) the big connector in the front left area in the engine bay (behind the headlight), and the connector to the abs pump (even if it was never disconnected during this process). Also I secured the big connector in the rear left wheel well with zip ties (its securing mechanism got damaged during the operation), and then the car just started. I’ll go back to the shop friday and saturday to complete everything and i’ll try to simulate that situation again (by disconnecting the rear connector and then each of those two in the engine bay ) to be sure where the issue was from, and i’ll keep you updated