After my software update via Sony Ericsson software update tool, below the version info:
Software ID: 1238-7064
Software Version: R1BA013
Customization ID: 1238-5894
Customization Version: R7A
Content Version: PA6
There is some website reported Aspend ROM / Flash size is 256MB, if you check the Device Information -> Hardware:
CPU: Qualcomm MSM7227
Speed: ARM11 - 600MHz
RAM Size: 256MB
Flash Size: 512MB
Data Bus: 32 bits
Display Resolution: 320 x 240
Colors: 65536 ( or 65k)
Will share more info after play with it in future....