the N2= 56% signal comes from generator-tachymeter installed on the accessory gear box of the engine N°1. You may pull all the circuit brakes of the plane; it will not help you. You have to climb to a safe altitude the shut down the engine ,raise the gear then restart the engine again.
By the way; I have a good question for you: the hyd engine driven pump N°1 solonoid is inop. By MEL you are authorised to go. After take off , during the after takeoff c/L you wantto position the landing gear lever to the Off position.
The lever is jammed in the up position. What do you have to do to extend the gear?