I would not recommend doing that. But if I were... I would completely back up my BB, do it, and it if doesn't load, reload the good OS and restore data from the back. Not a real big gamble. I don't think it will "fry" any electronics, of course*.

Finally, remember there IS a reason these are BETA Operating Systems, and there IS a reason it is NOT released to the public for use. It is NOT finished. Use at your own risk.

I don't think many of us will be supporting questions here on the forum answering questions on how to troubleshoot OS 4.5, UNTIL it is in final public release. Until then, it is impossible to know what version of the release one is using, etc., and they are different from one release step the next.

*Disclaimer: I did NOT sleep at a Holiday Inn Express last night.