[One (M7) Q&A, Help & Troubleshooting] cagashe:
Okay. I followed all the steps again and flashed firmware to see any possible errors. I see two possible issues in firmware flash. (Highlighted in red)

(bootloader) adopting the signature contained in this image.

(bootloader) signature checking...

(bootloader) zip header checking...

(bootloader) zip info parsing...

(bootloader) checking model ID...

(bootloader) checking custom ID...

(bootloader) checking main version...

(bootloader) checking hboot version...

(bootloader) start image[boot] unzipping & flushing...

(bootloader) [RUU]UZ,boot,0

(bootloader) [RUU]UZ,boot,13

(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,7

(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,66

(bootloader) [RUU]UZ,recovery,73

(bootloader) [RUU]UZ,recovery,78

(bootloader) [RUU]UZ,recovery,86

(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) signature checking...

(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) ...... 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,80

(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]WP,rcdata,0

(bootloader) ...... Successful

OKAY [ 24.261s]

finished. total time: 27.521s