Xperia Mini Pro SK17i, SK17a
From Mobile Wiki
Available as two versions, SK17i and SK17a, including the following bands:
SK17i: GSM-850/900/1800/1900 WCDMA-900/2100
SK17a: GSM-850/900/1800/1900 WCDMA-850/1900/2100
Please note that when you connect your phone to the computer to flash the phone, it must be turned off and you must hold the flash key listed below.
Volume Down key