[Help] SEUS Not Work/ Flashtool error - Sony Ericsson Xperia Mini, Mini Pro, Xperia Pro, A

I have a Mini Pro here and try flashing any firmware by FlashTool I get the following error:
ERR_SEVERITY = "MAJOR"; ERR_CLASS = "SECURITY_CLASS"; ERR_STATIC = "SIN_HEAD_VER"; ERR_DYNAMIC = "Failed to verify header sin";
And for some reason the phone will not turn over, after appearing "sony ericsson" on the screen appears the image of a triangle and an exclamation point and off.
While trying to retrieve with the Sony Update Service, the program says that the update failed and tells me to check the battery.
To try to fix, I tried flashing other kernels, but it did not work, when I flash the firmware I get the same error
Please help

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Try to repair via SEUS or PC Companion, Recharge your battery to full if it says "Check the battery". If didn't work, Try to re-flash a stock firmware via Flashtool. I hope this would solve your problem.

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JesterGuerrero said:
Try to repair via SEUS or PC Companion, Recharge your battery to full if it says "Check the battery". If didn't work, Try to re-flash a stock firmware via Flashtool. I hope this would solve your problem.
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"While trying to retrieve with the Sony Update Service (SEUS), the program says that the update failed and tells me to check the battery"
I do not think the problem is the battery, because I tried with others.
Anyway, I used this tutorial http://forum.xda-developers.com/showthread.php?t=1126358
After that I could turn on the phone normally, it is at version 4.0.A.2.335 and baseband 8x55A-AAABQOAZM-20302203-30
But I still get the same error with FlashTool and repair with PC Companion or SEUS still does not work.