I've just got Zenphone 4 yesterday and would like to update to KK. I have some questions to those who have updated their Z4 to KK and hope someone can answer :

1. I want to manually download KK from Asus website but confused with 2 versions of the firmware: CHT and WW SKU. Which one should I download? My current build number is JSS15Q.WW_Zenphone-V4.3.11-20140804010151_201312100112

2. Is there any problem after which I install the update? I've read some of the previous posts that Zen 5 users have some problems with KK update. How about Zen 4 users?

Thanks.