I realize this thread is a few months old, but for what it's worth, I just received a DS-2CD2032-I through Amazon.com. I bought the "English Retail Box" version, believing it was supported/covered by warranty. It came with firmware 5.2.5, and I already had another one with 5.3.0 on it, so I figured what the heck... try the firmware upgrade. Well... I downloaded from Hikvision's site, the US-EN 5.3.0 version (build 150153) and it installed flawlessly.
However, after reboot, I couldn't log back in with the admin password I entered earlier. I contacted Hikvision support in the US, who informed me the camera was not made I the US, or covered by them. I had to email China's support with the serial number to reset the default password. While waiting or them to respond, I found a thread that suggested unpowering the camera, holding the reset button down and plugging back in. I held for 10 secs and released. I tried to login again and was asked to reset the default password. Thank god!
Bottom line. Successful upgrade to 5.3.0, but not without pain. No more upgrades for me!