How to fix flashtool error

[u-tag]

Today i try to flash stock firmware using flashtool. Then it display this error "ERR_SEVERITY="MINOR";ERR_CLASS="PROTOCOL_CLASS";ERR_STATIC="UNVALID_COMMAND";ERR_DYNAMIC="ST_F_2";" and flash abort. Now i can't flash firmware still i got that error. But i can enable fastboot and flash mode and phone display only kernel bootlogo, after that it display tringal with phone. How do i unbrick my Live with walkman?

Thanks!

[Nabeel]

it happened maybe because you have had chosen the wrong firmware

Reinstall your software using PC COMPANION OR SUS

[u-tag]

Thanks you "Nabeel" your respond.

I have unlocked bootloader WT19i phone. If use Sony Update service, it recongnize my phone, but it display "The phone contains modified softwrare that can't be updated". If i use Sony PC companianion, it recognize Sony phone connected, but there's no option to update.

Before i face this issue, i used custom ROM (More than 3 months), today when i try to flash stock firmwawre i face this issue. Are there any way to fix it without submitting service center? Becausae of if i submitted it to the service center they take few weeks.

Thanks!

[u-tag]

I don't know exact reason, after reboot my PC, flashtool sucessfully flash GB firmware. Looks like its my PC issue.

Thanks modarator.