[One (M7) General] rc420head:
worked like a dream

c:\fastboot>fastboot oem rebootRUU
...
(bootloader) Start Verify: 0
OKAY [ 0.056s]
finished. total time: 0.057s

c:\fastboot>fastboot flash zip firmware5.11.1540.9.zip
target reported max download size of 1526722560 bytes
sending 'zip' (44103 KB)...
OKAY [ 2.568s]
writing 'zip'...
(bootloader) zip header checking...
(bootloader) shift signature_size for header checking...
(bootloader) zip info parsing...
(bootloader) checking model ID...
(bootloader) checking custom ID...
(bootloader) start image[hboot] unzipping for pre-update check...
(bootloader) start image[hboot] flushing...
(bootloader) [RUU]WP,hboot,0
(bootloader) [RUU]WP,hboot,99
(bootloader) [RUU]WP,hboot,100
(bootloader) ...... Successful
FAILED (remote: 90 hboot pre-update! please flush image again immediately)
finished. total time: 4.264s

c:\fastboot>fastboot flash zip firmware5.11.1540.9.zip
target reported max download size of 1514139648 bytes
sending 'zip' (44103 KB)...
OKAY [ 2.702s]
writing 'zip'...
(bootloader) zip header checking...
(bootloader) shift signature_size for header checking...
(bootloader) zip info parsing...
(bootloader) checking model ID...
(bootloader) checking custom ID...
(bootloader) start image[boot] unzipping & flushing...
(bootloader) [RUU]UZ,boot,0
(bootloader) [RUU]UZ,boot,11
(bootloader) [RUU]UZ,boot,24
(bootloader) [RUU]UZ,boot,35
(bootloader) [RUU]UZ,boot,46
(bootloader) [RUU]UZ,boot,59
(bootloader) [RUU]UZ,boot,72
(bootloader) [RUU]UZ,boot,85
(bootloader) [RUU]UZ,boot,99
(bootloader) [RUU]UZ,boot,100
(bootloader) [RUU]WP,boot,0
(bootloader) [RUU]WP,boot,99
(bootloader) [RUU]WP,boot,100
(bootloader) ...... Successful
(bootloader) start image[recovery] unzipping & flushing...
(bootloader) [RUU]UZ,recovery,0
(bootloader) [RUU]UZ,recovery,6
(bootloader) [RUU]UZ,recovery,12
(bootloader) [RUU]UZ,recovery,20
(bootloader) [RUU]UZ,recovery,31
(bootloader) [RUU]UZ,recovery,38
(bootloader) [RUU]UZ,recovery,45
(bootloader) [RUU]UZ,recovery,68
(bootloader) [RUU]UZ,recovery,76
(bootloader) [RUU]UZ,recovery,82
(bootloader) [RUU]UZ,recovery,87
(bootloader) [RUU]UZ,recovery,95
(bootloader) [RUU]UZ,recovery,100
(bootloader) [RUU]WP,recovery,0
(bootloader) [RUU]WP,recovery,99
(bootloader) [RUU]WP,recovery,100
(bootloader) ...... Successful
(bootloader) start image[rpm] unzipping & flushing...
(bootloader) [RUU]UZ,rpm,0
(bootloader) [RUU]UZ,rpm,100
(bootloader) [RUU]WP,rpm,0
(bootloader) [RUU]WP,rpm,100
(bootloader) ...... Successful
(bootloader) start image[sbl1-1] unzipping & flushing...
(bootloader) [RUU]UZ,sbl1-1,0
(bootloader) [RUU]UZ,sbl1-1,100
(bootloader) signature checking...
(bootloader) verified fail
(bootloader) ..... Bypassed
(bootloader) start image[sbl1-2] unzipping & flushing...
(bootloader) [RUU]UZ,sbl1-2,0
(bootloader) [RUU]UZ,sbl1-2,100
(bootloader) signature checking...
(bootloader) verified fail
(bootloader) ..... Bypassed
(bootloader) start image[sbl1-3] unzipping & flushing...
(bootloader) [RUU]UZ,sbl1-3,0
(bootloader) [RUU]UZ,sbl1-3,100
(bootloader) signature checking...
(bootloader) [RUU]WP,sbl1-3,0
(bootloader) [RUU]WP,sbl1-3,100
(bootloader) ...... Successful
(bootloader) start image[sp1] unzipping & flushing...
(bootloader) [RUU]UZ,sp1,0
(bootloader) [RUU]UZ,sp1,99
(bootloader) [RUU]UZ,sp1,100
(bootloader) [RUU]WP,sp1,0
(bootloader) [RUU]WP,sp1,100
(bootloader) ...... Successful
(bootloader) start image[radio] unzipping & flushing...
(bootloader) [RUU]UZ,radio,0
(bootloader) [RUU]UZ,radio,6
(bootloader) [RUU]UZ,radio,11
(bootloader) [RUU]UZ,radio,17
(bootloader) [RUU]UZ,radio,23
(bootloader) [RUU]UZ,radio,28
(bootloader) [RUU]UZ,radio,34
(bootloader) [RUU]UZ,radio,40
(bootloader) [RUU]UZ,radio,46
(bootloader) [RUU]UZ,radio,52
(bootloader) [RUU]UZ,radio,59
(bootloader) [RUU]UZ,radio,69
(bootloader) [RUU]UZ,radio,75
(bootloader) [RUU]UZ,radio,81
(bootloader) [RUU]UZ,radio,87
(bootloader) [RUU]UZ,radio,92
(bootloader) [RUU]UZ,radio,99
(bootloader) [RUU]UZ,radio,100
(bootloader) [RUU]WP,radio,0
(bootloader) [RUU]WP,radio,23
(bootloader) [RUU]WP,radio,46
(bootloader) [RUU]WP,radio,69
(bootloader) [RUU]WP,radio,92
(bootloader) [RUU]WP,radio,100
(bootloader) ...... Successful
(bootloader) start image[rcdata] unzipping & flushing...
(bootloader) [RUU]UZ,rcdata,0
(bootloader) [RUU]UZ,rcdata,42949671
(bootloader) [RUU]WP,rcdata,0
(bootloader) [RUU]WP,rcdata,42949671
(bootloader) ...... Successful
OKAY [ 18.667s]
finished. total time: 21.373s

c:\fastboot>fastboot reboot-bootloader
rebooting into bootloader...
OKAY [ 0.041s]
finished. total time: 0.042s