How to roll back firmware?

Hi, I recently just found out that my dvd drive(HP 300n/NEC ND-1100A 4X DVD+R/RW) have some problems reading burnt dvds and burning dvds, I tried a few brands of media and they all dont work. So I installed this firmware for my drive and sadly I got the wrong one and its for the hp 300 series which appearantly is different than mine… its confusing. So I want to know how can I install the real one or rollback to my previous version so I can install the one thats really for my drive?

Use TDB’s DOS-Flasher or BINFLASH and a appropriate firmware.