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C:\xxx>fastboot flash recovery c:\recovery.img
sending 'recovery' (10336 KB)...
OKAY [  1.988s]
writing 'recovery'...
(bootloader) signature checking...
**FAILED (remote: 12 signature verify fail)**
finished. total time: 2.966s
  • HTC One M7 on the way back to stock
  • Bootloader is locked 1.54.0000
  • OS is 2.24.401.1

the message Output above is sample for everything I try to flash. Recovery ist stock. Message appears also when trying to install 2.24.401.1 via RUU.

Anyone have an idea?

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Yepp, maybe. What is it you're trying to flash? My guess is, it's nothing provided by HTC, but some 3rd-party images. They are naturally not signed with HTC's signature, so the (locked) loader refuses to accept them as legit sources. –  Izzy Aug 24 '13 at 19:02
    
You'll need to flash a custom kernel to be able to do this. –  Jeffrey Lin Aug 25 '13 at 3:01
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