Trick is to always use the GSM or CDMA or UMTS folder
-with its respective file inside- valid for your handheld type. NEVER
delete/swap the file within that folder by/with
file from a different handheld type OS.
In other words, a GSM handheld cannot
a CDMA/UMTS radio, or vice-versa.
Java folder can be mixed/over-ridden by newer OS from different handheld type.
And of course, the Blackberry.alx needs to be modified to
make use of the extra locked Vendor themes.
Just my 2bw.
Always remember, if I brick my handheld, I am to blame.