Thanks for the link. This is why there are so many threads on the CrackBerry forums that address 10.3 issues being experienced by Z10, Z30 and Q10 users. As I said previously in this thread, it's better to have a fully-functional phone running 10.2 than a 10.3 paperweight. BlackBerry had obviously envisioned this OS update to work for older models, so it'll just take a bit more time for them to figure out what went wrong and fix it.
I'm glad I didn't try to load this OS update on my own through some website or link provided in the CrackBerry forums.