I have done reboots with no masturbation and I have also done them with masturbation. In essence I dont think masturbation is bad. Infact its natural if its done for sensation and without orgasam as the main goal. Also it should not be done several times in a day and it should be done with lube.
BUT as i've found out. It can hi-jack a reboot, especially in the early days. As I approach re-booting again I have decided to ditch it and concentrate on a solid 90 days of no PMO. I may introduce masturbation again if i dont have a partner. But I need to heal first so it needs to go!
Thats my thoughts anyway. Good luck! Remember many are here for you.