(adsbygoogle = window.adsbygoogle || []).push({}); I have a ps3 model cechG01 on official 3.55, can I go straight to rogero 4.50 cex, because I read something about doing some QA Flag thing first? And also what is a QA Flag?

It is safe practice to QA flag you PS3 before anything.
Here are some websites I use to make people understand:
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Thanks for the reply but rogero cex v 1.01 has The LV1 hash check disabled so you can install it on a console that isnt dehashed and it also has QA Flag enabled by default !