Xperia Pro MK16i recognized as SK17i by Flashtool

I got used Xperia Pro working with Gingerbread. It has unlocked bootloader and I can flash any custom kernel, but I can't flash any stock firmware. Flashtool show me this:

Code:

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Device connected in flash mode
INFO  - Selected Bundle for Xperia PRO MK16i. FW release : ICS 4.0.4 587. Customization : Sony
INFO  - Preparing files for flashing
INFO  - Please connect your device into flashmode.
INFO  - Opening device for R/W
INFO  - Reading device information
INFO  - Phone ready for flashmode operations.
INFO  - Opening TA partition 2
INFO  - Current device : SK17i - CB5A1KFAXV - 1254-2250_R5D - 1243-7775_4.1.B.0.587 - WORLD-i_4.0.2.A.0.69
INFO  - Closing TA partition
INFO  - Start Flashing
INFO  - Processing loader.sin
INFO  -    Checking header
ERROR - Processing of loader.sin finished with errors.
INFO  - Ending flash session

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And stuck - after disconnecting usb additionally shows

Code:

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ERROR -
ERROR - Error flashing. Aborted
INFO  - Device disconnected

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What is wrong with this phone??

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