I meant to tell you -- thanks for this info. Turns out you cannot perform this procedure if you're connected to BES (apparently that marks the service books as read-only.) I was able to do this over the weekend when I reinstalled .314 with the radio file from .348, just before I re-activated to BES. Worked like a champ.
I think the .348 radio file fixed my poor call audio problems; I made several calls since then and it's been fine. Is it possible this addresses the memory leaks/battery life problems as well? I don't seem to have those problems anymore either.
I have just recently upgraded my Bold from 22.214.171.1244 to 126.96.36.1994, at first the "wild" reboot happen when connection change from 3G to 2G. After reading some threads I tried to change the .314 with .348, and it surely reduce the "wild" reboot. It is not fix totally, but in my case it really reduce it. Only when the signal is absent, then my Bold will reboot. As far as I know, when the signal still there (regardless of 3/2G) no reboot will happen.
Usually I get 2/3 reboots per day, no other problem found so far. Though still hardly finds themes for OS 5, I think the default themes are good enough. All softs run well, speed is a bit increasing, nice visual enhancements and some extras default utilities included. Some softs, will auto upgraded by the developer through the OTA download while some still in OS 4.6.
Finally, my personal opinions are;
1. Change the radio with .348 (reducing 3/2G wild reboot)
2. Use soft made for OS 4.7 and above
3. Until somebody made it, stay with default themes
4. Since this is a leaked OS, some glitches will always happen
5. If you don't know what you are doing, never try to use leaked/beta OS
BlackBerry Bold 9000
OS 188.8.131.524/.348 radio
8GB SDHC class 6
10 days in OS 5.314