Customise File for W890i

[GinnCorvus]

Thanks! one more question.
What are differences between R2A,R3A,and R4A (in another word, what do R2A, R3A and R4A mean) in these customised files :
W890i_1205-0633_R2A_Starhub_Singapore
W890i_1205-0633_R3A_Starhub_Singapore
W890i_1205-0633_R4A_Starhub_Singapore
Cheers.

It's the Revision of Custom Pack. A low number mean a more generic personalization but same function. Choose one, not important.