Thai jcv is locked.
There are many jcv versions for specific model in Thailand because different of screen and unit ability ., Like JCV for 37xx in EU map.

If you have unit that can display Thai jcv., Which jcv version is not matter.
( ie Sg 765 v2.50 can use any of Thai jcv versions and bigger size is better.!! )

For 14xx US can not use Thai jcv.
You must try to convert to Sg/My OS.