Question Can't update Verizon HTC one m8 from China! Current update: 1.12.605

I don't live in the U.S and I got a Verizon 32 Gb HTC one M8. I live in China. ( I am not Chinese though)

Whenever I try to update, or check for updates, I get the "check now" disabled with a message saying "software update only work in CDMA mode". And because of this problem, I bought a CDMA SIM card. Now, I see the "Check now" is activated, but whenever I check for updates, it only pops up a checking now screen, and then disappears with nothing. Just nothing. Period.

Please help me update my phone! I'm currently on 1.12.605.11 update, and I extremely need the "Extreme power saving mode" which is lacking right now.

Should I root? Unlock? or what?

Thanks in Advance!