[KIOWA69]

well the pc36img could be a couple of different things, it could be a rom or it could be a kernal so that's why it's a good idea to maybe throw a name after it, i.e. pc36img-bootscreen <make sure to take off the bootscreen part if you are going to try and flash it as the phone won't recognize it with that name> and stick it in a folder that you put on your sd card named bootscreens so that you keep your stuff seperate, i suggest making a folder on your sd card for roms, kernals, radios, bootscreens or anything else that you want to save to your sd card and that way you can keep them seperate. personally i have a copy of the stock rom on my sd card, a couple of custom roms, a couple kernals and that way if my phone messes up while i'm away from my computer i have everything i need on my sd card that's in the phone.

your supposed to wipe the dalvik cache and those other items so that when you flash a rom or kernal that you take off the old information and won't have conflicts because your flashing new stuff over the old, i know this is not the best information or down to the last detail but it's what i understand as why you do those things, suggest you search on this site or google it if what i explained wasn't clear.