Out of curiosity I've tried to extract and flash SPL alone, but seems to be failing:
Code:
$ ./android-sdk-linux_86/tools/fastboot flash hboot hboot_8x50_0.35.0017_100610.nb0
sending 'hboot' (512 KB)... OKAY
writing 'hboot'... INFOsignature checking...
FAILED (remote: signature verify fail)
Any idea?