[Desire Q&A, Help & Troubleshooting] popepope:
when I run fastboot flash zip pb99img.zip I get the log below: (probably because I have hboot 0.80xx on the phone and the img has 0.9xx)

D:\AndroidSDK\tools>fastboot flash zip PB99IMG_Bravo_Froyo_HTC_WWE_2.09.405.8_Ra

dio_32.43.00.32U_5.09.00.20_release_140022_signed.zip

sending 'zip' (161024 KB)... OKAY [ 27.219s]

writing 'zip'... INFOadopting the signature contained in this i

mage...

INFOsignature checking...

INFOzip header checking...

INFOzip info parsing...

INFOchecking model ID...

INFOchecking custom ID...

INFOchecking main version...

INFOstart image[hboot] unzipping for pre-update check...

INFOstart image[hboot] flushing...

INFO[RUU]WP,hboot,0

INFO[RUU]WP,hboot,100

FAILED (remote: 90 hboot pre-update! please flush image again immediately)

finished. total time: 53.078s

in the mean time I also downloaded a pb99img file that pertains to a 2.1 OS version and here is the log:

D:\AndroidSDK\tools>fastboot flash zip PB99IMG_Bravo_HTC_WWE_1.21.405.2_Radio_32

.36.00.28U_4.06.00.02_2_release_126984_signed_txt.zip

sending 'zip' (140790 KB)... OKAY [ 23.797s]

writing 'zip'... INFOadopting the signature contained in this i

mage...

INFOsignature checking...

INFOzip header checking...

INFOzip info parsing...

INFOchecking model ID...

INFOchecking custom ID...

INFOchecking main version...

INFOstart image[boot] unzipping & flushing...

INFO[RUU]UZ,boot,0

INFO[RUU]UZ,boot,40

INFO[RUU]UZ,boot,80

INFO[RUU]UZ,boot,100

INFO[RUU]WP,boot,0

INFO[RUU]WP,boot,45

INFO[RUU]WP,boot,90

INFO[RUU]WP,boot,100

INFOstart image[radio] unzipping & flushing...

INFO[RUU]UZ,radio,0

INFO[RUU]UZ,radio,8

INFO[RUU]UZ,radio,16

INFO[RUU]UZ,radio,24

INFO[RUU]UZ,radio,32

INFO[RUU]UZ,radio,37

INFO[RUU]UZ,radio,45

INFO[RUU]UZ,radio,53

INFO[RUU]UZ,radio,61

INFO[RUU]UZ,radio,69

INFO[RUU]UZ,radio,78

INFO[RUU]UZ,radio,86

INFO[RUU]UZ,radio,97

INFO[RUU]UZ,radio,100

INFO[RUU]WP,radio,0

INFO[RUU]WP,radio,6

INFO[RUU]WP,radio,100

INFOstart image[rcdata] unzipping & flushing...

INFO[RUU]UZ,rcdata,0

INFO[RUU]WP,rcdata,0

INFO[RUU]WP,rcdata,100

INFOstart image[recovery] unzipping & flushing...

INFO[RUU]UZ,recovery,0

INFO[RUU]UZ,recovery,22

INFO[RUU]UZ,recovery,44

INFO[RUU]UZ,recovery,65

INFO[RUU]UZ,recovery,93

INFO[RUU]UZ,recovery,100

INFO[RUU]WP,recovery,0

INFO[RUU]WP,recovery,22

INFO[RUU]WP,recovery,44

INFO[RUU]WP,recovery,67

INFO[RUU]WP,recovery,89

INFO[RUU]WP,recovery,100

INFOstart image[sp1] unzipping & flushing...

INFO[RUU]UZ,sp1,0

INFO[RUU]UZ,sp1,100

INFO[RUU]WP,sp1,0

INFO[RUU]WP,sp1,100

INFOstart image[system] unzipping & flushing...

INFO[RUU]UZ,system,0

INFO[RUU]UZ,system,3

INFO[RUU]UZ,system,6

INFO[RUU]UZ,system,10

INFO[RUU]UZ,system,13

INFO[RUU]UZ,system,17

INFO[RUU]UZ,system,20

INFO[RUU]UZ,system,23

INFO[RUU]UZ,system,27

INFO[RUU]UZ,system,31

INFO[RUU]UZ,system,34

INFO[RUU]UZ,system,37

INFO[RUU]UZ,system,41

INFO[RUU]UZ,system,45

INFO[RUU]UZ,system,48

INFO[RUU]UZ,system,52

INFO[RUU]UZ,system,55

INFO[RUU]WP,system,0

INFO[RUU]WP,system,55

INFO[RUU]UZ,system,55

INFO[RUU]UZ,system,58

INFO[RUU]UZ,system,62

INFO[RUU]UZ,system,65

INFO[RUU]UZ,system,68

INFO[RUU]UZ,system,72

INFO[RUU]UZ,system,76

INFO[RUU]UZ,system,79

INFO[RUU]UZ,system,83

INFO[RUU]UZ,system,86

INFO[RUU]UZ,system,90

INFO[RUU]UZ,system,92

INFO[RUU]UZ,system,95

INFO[RUU]UZ,system,99

INFO[RUU]UZ,system,100

INFO[RUU]WP,system,55

INFO[RUU]WP,system,58

INFO[RUU]WP,system,62

INFO[RUU]WP,system,65

INFO[RUU]WP,system,69

INFO[RUU]WP,system,73

INFO[RUU]WP,system,76

INFO[RUU]WP,system,79

INFO[RUU]WP,system,83

INFO[RUU]WP,system,86

INFO[RUU]WP,system,90

INFO[RUU]WP,system,94

INFO[RUU]WP,system,97

INFO[RUU]WP,system,100

INFOstart image[userdata] unzipping & flushing...

INFO[RUU]UZ,userdata,0

INFO[RUU]UZ,userdata,100

INFO[RUU]WP,userdata,0

INFO[RUU]WP,userdata,100

FAILED (remote: 51 partition update fail)

finished. total time: 144.188s

I noticed one thing...during the update, there is a progress bar on the phone that is normally green and turns red for a second...that happens when exactly this line appears in cmd: INFO[RUU]WP,radio,100

I'm not sure what it means or if it means something, but maybe somebody might get a hint out of it.