I already tried to flash this RUU update:
I bought my phone in China, because it does not come with google play and some of the apps (Gmail, Line, etc..) won't install on the phone, I am really looking forward to flash my phone.
My phone was S-off and re-locked (I unlocked it and re-locked it);
and you actually need to have the phone locked in order to flash this RUU, however, I was unable to flash it due to CID not matching warning.
Highly recommend a separate forum for Desire V, as it's gaining popularity, it's quite confusing trying to find posts related to Desire V.