If i want to update to OFW, do I just need to remove al emulators and homebrew in XMB? Or do they need to be removed more thouroughly?
You can just uninstall them via XMB, although if you want a fail-safe method, should Sony ban a MFW-installed/homebrew-installed PS3 unit, then uninstall the applications, wipe the HDD and start from scratch.