!!!!!! Warning !!!!!! Do NOT mix drives between the 40xx,30xxx/Showstopper and the 20xx series!!!!! It will not work! You run the risk of messing up your unit. However, You CAN change drives between, say a 2020 and a 2003 or even between a 3060 and Showstopper. Aug2-4000-4.3.zip is for replay4000 & 4500 series recorders that have already been upgraded to 4.3. Earlier software versions will not boot in post 4.3 recorders. Replay40xximage original version.zip and RTV4040 v4.1.zip are for Replay 4000 series recorders only. Pre 4.3 software (image dated Jan 2002). For post 4.3 software use Aug2-4000-4.3.zip image. Showstopper&Replay30XXimage3.02.zip is 3.02 for PVHS1000/2000/3000 and Replay 3000 series recorders (not Replay 2000 series). Replay20XXimage.zip is 3.0 for Replay 2000 series recorders only (not Showstopper). PanSS-2710comboV2.0.zip is for panasonic combo recorders and is 2.0. 3.0 software WILL NOT WORK.