A method for resetting an apparatus (10, 2010) configured for stapling tissue, the apparatus comprising: (a) a stapling head assembly, wherein the stapling head assembly comprises: (i) an annularly arranged array of staples, and (ii) a knife with an annular cutting edge that is configured to cut tissue; (b) a shaft assembly coupled to the stapling head assembly, wherein the shaft assembly comprises a drive bracket; and (c) a body coupled to the shaft assembly, wherein the body comprises: (i) a motor (160, 2160), and (ii) a cam member configured to rotate in response to activation of the motor, wherein the cam member is rotatable in a first direction from a home position to a fired position, (iii) a cam follower, wherein the cam member is configured to interact with the cam follower to pivot the cam follower, the cam follower is pivotably coupled with the drive bracket, wherein pivoting of the cam follower, due to rotation of the cam member in the first direction from the home position to the fired position, drives the drive bracket distally to actuate the stapling head assembly to thereby drive the staples and the knife through tissue; wherein the method comprises: (a) providing an apparatus, in a testing or quality control setting, or after use in a procedure, including the cam member in the fired position: characterised in that the method comprises: (b) changing the polarity of the motor; and (c) activating the motor such that the cam member rotates in a second direction from the fired position to the home position, wherein pivoting of the cam follower, due to rotation of the cam member in the second direction from the fired position to the home position, drives the drive bracket proximally, resulting in resetting of the apparatus. (a) a stapling head assembly, wherein the stapling head assembly comprises: (i) an annularly arranged array of staples, and (ii) a knife with an annular cutting edge that is configured to cut tissue; (i) an annularly arranged array of staples, and (ii) a knife with an annular cutting edge that is configured to cut tissue; (b) a shaft assembly coupled to the stapling head assembly, wherein the shaft assembly comprises a drive bracket; and (c) a body coupled to the shaft assembly, wherein the body comprises: (i) a motor (160, 2160), and (ii) a cam member configured to rotate in response to activation of the motor, wherein the cam member is rotatable in a first direction from a home position to a fired position, (iii) a cam follower, wherein the cam member is configured to interact with the cam follower to pivot the cam follower, the cam follower is pivotably coupled with the drive bracket, wherein pivoting of the cam follower, due to rotation of the cam member in the first direction from the home position to the fired position, drives the drive bracket distally to actuate the stapling head assembly to thereby drive the staples and the knife through tissue; (i) a motor (160, 2160), and (ii) a cam member configured to rotate in response to activation of the motor, wherein the cam member is rotatable in a first direction from a home position to a fired position, (iii) a cam follower, wherein the cam member is configured to interact with the cam follower to pivot the cam follower, the cam follower is pivotably coupled with the drive bracket, wherein pivoting of the cam follower, due to rotation of the cam member in the first direction from the home position to the fired position, drives the drive bracket distally to actuate the stapling head assembly to thereby drive the staples and the knife through tissue; (a) providing an apparatus, in a testing or quality control setting, or after use in a procedure, including the cam member in the fired position: characterised in that the method comprises: characterised in that the method comprises: (b) changing the polarity of the motor; and (c) activating the motor such that the cam member rotates in a second direction from the fired position to the home position, wherein pivoting of the cam follower, due to rotation of the cam member in the second direction from the fired position to the home position, drives the drive bracket proximally, resulting in resetting of the apparatus.