Okay, that's all I needed to know. Now I'll assume you can turn on your PS3 normally and get to XMB. You don't need to go into recovery mode to install CFW, you can do it from XMB directly (Settings -> System Update -> Update from storage media). I still don't understand what exactly are you trying to do with SELECT+START...
Anyway, the only problem you might have is that your file doesn't have the proper name, it's not PS3/UPDATE/UPDATE.PUP, the correct name is \PS3\UPDATE\PS3UPDAT.PUP
- make sure your flash is formatted to FAT32 and your Kmeaw CFW (or any other) is properly named, then do the update (Settings -> System Update -> Update from storage media).
If you can't install, try downloading your CFW from another source. For example - Kmeaw 3.55 CFW
and his Noob Jailbreak Guide
I hope I managed to help you, I'm sorry but I don't understand turkish, only a little bit (I'm bosnian). If none of this helps, open a new thread and ask for somebody who understands turkish IN THE TITLE, that way there's a greater chance for you to get proper help.