I'm assuming you mean load the SP4 interim update, not the one from SP5. That will certainly fix the issue. If you start getting 4.5 devices though, you might want to consider at least testing it, there are several new 4.5 features that require SP5, and for official HTML support, SP6.
Considering SP6 was released early because of the PDF issue, it's not unreasonable to hold off on putting SP6 on your server.
On the other hand, with backups of the BES database, it doesn't take much to get it back up and running.
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