Best way to fully wipe after root?

A

AC Question

What is the best way to fully wipe Samsung S5 (SM-G900F)?

I'm wanting to fully clear my phone as Chrome connected to WiFi can take up to 20 seconds to resolve pages and my battery life has declined to 12 hours or so when it used to last a day! I've installed Avast AV to scan for malware but nothing found but I don't feel confident that something isn't installed on it with all these vulnerabilities such as Stagefright and so on.

Other question I have is my phone was originally carrier locked to O2 (UK Carrier) so when install their firmware again will I be back to been carrier locked?
 

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