Mine is SME set, unrooted, stock ROM (XXALJ3). I have few questions regarding update to 4.1.2.

1. Tried OTA update but it prompts "Access to the software update service is provided to users in the order in which they request it. Try later". Why?

2. Tried KIES update and it prompts "Your device's current firmware version is not supported to update firmware via Kies". Why?

3. Thinking to download and flash via ODIN. Is there any disadvantages? (ie. my flash counter will increase to 1 and my warranty will void, unable to receive OTA update in future, etc)

Appreciate if someone can help me. Thanks!

Will try update via ODIN then.
Appreciate your help very much. Thanks!