Bricked while flashing ViperX 2.0.0

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http://forum.xda-developers.com – Hi, I think I bricked my device. I have HBOOT working, but no recovery and /system. When I enter recovery, it shows recovery bootscreen (I use TWRP) and it reboots after 2-3 seconds. After this I will not flash any ROMs I think. I can't do fastboot erase cache, coz I'm on Windows XP, and CMD says that this command does not exist. (HowTos)