serious problem, help me

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http://forum.xda-developers.com – my phone is now empty, it can only access the recovery (TWRP) and the bootloader. if I try to flash a ROM appears first HTC screen(HTC quietly brillant) and then black screen. I have Hboot 1.14. Windows have problems installing the Android SDK because it does not start SDK Manager. Ubuntu seems okay, in fact, when I give the command: "sudo fastboot devices", it manages to find a serial number but when I give the command: "cd / home / etc ... etc. ... fastboot flash boot.img (boot.img or fastboot or fastboot flash boot boot.img) crashes all on: "Waiting for device&quo (HowTos)