Installed custom rom, lost root and cant flash ftf image of any rom.

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http://forum.xda-developers.com – Hi guys, I am stuck in a very bad sitituation. I have installed a custom rom, but after some time I came to know I have lost root access. My phone's BLlocked. So cannot install cmw recovery without root. I tried flashing official Sony Xperia sk17i 4.1.b.587 .ftf file. But I am getting error as FLASHING ABORTED and the device restarts. I am attaching the flasboot screenshot. Please help me flash the stock rom, then I will be able to again gain root access. Thank You. Attached Thumbnails   (HowTos)