Having done this many times on my bionic... This is my process
1. Fxz to 902 (there is a 905 Fxz but it has given me problems)
2. Take 905 ota update
3. Install ICS leak 232 via factory recovery.
Personally I then root via motofail razrs edge... Latest safestrap... (via rombot.org) and custom ROM.
But stock 232 is great and with the above steps.... I've never had even a Hiccup. If you're a noob I can write more detailed steps but they are written up in many places.
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