M8 stock rom

[DM Yeamin]

my current software version is 6.12.401.4
can I go back to its stock rom using RUU?
and the phone is European WWE. is there any way to convert it to WWE Asia?

 

[redpoint73]

my current software version is 6.12.401.4
can I go back to its stock rom using RUU?

Yes, you can use the RUU.zip and method from here: https://forum.xda-developers.com/showpost.php?p=64926626&postcount=6

and the phone is European WWE. is there any way to convert it to WWE Asia?

You mean fully convert using RUU? You would need s-off ($25 by sunshine app, unless it already happens to be s-off) and change the CID. Unless you are seeking the change the band support, its probably not worth it to fully convert.