mobile

I hate a Sprint HTC One m7- i have had it for a few years. have been running viper v7 and TWRP for a while, was getting it ready update to Viper v8 and was working on updating firmware, the RUU wouldn't flash so I fallowed a few topics and screwed something up. At some point I fastbooted a command (maybe ADB but think it was fastboot) that changed the Android ver to another number , I am looking for the Forum i got the info from but cannot find it in my history.

Anyways, Now i have no OS and no revoery, it boots directly to fastboot, anytime i try and fast boot TWRP or CWM i get
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C:\android>fastboot flash recovery recovery-clockwork-touch-6.0.4.8-m7spr.img
target reported max download size of 1481973760 bytes
sending 'recovery' (8758 KB)...
OKAY [ 1.092s]
writing 'recovery'...
(bootloader) signature checking...
FAILED (remote: signature verify fail)
finished. total time: 1.981s
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When I try to run an RUU it stalls at Signature checking.

Any help on fixing this would be great. If I can find that forum topic i will post it ASAP