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yet another "just a few questions" [3.60]
2. The only one that would be use for to a 3.60 system would be the e3 flasher (for downgrading to 3.55). The True Blue and Cobra dongles are useful after you get your system to 3.55.
3. It will void the warranty if you open your PS3.
4. Mostly correct (check out True Blue dongle)
Niether dongke is useful after downgrade with e3flasher as they require a different CFW and that is likely to brick your PS3 if you install any other CFW or OFW 3.55 on it after downgrade with the e3 flasher. If im not mistaken however PS3s equiped with a progskeet which actually requires soldering unlike e3 flasher do not have this issue. bassically resaearch the available flashers before you buy also note that a a bad install of the flashers could really jack up the system.