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[Guide] How to root, install EXT4 recovery and custom ROM on HBOOT 2.00.0002

Hi, A short but effective guide for people who want to root their Desire S while keeping HBOOT 2.00.0002 and S-ON. This is what I did with my phone yesterday, but took me a lot of time to figure things out, so I'm writing this for myself and other people.
1) First of all set up ADB and Fastboot. [GUIDE] Easy and simple adb and fastboot setup for newbies (Windows only)
Also download the ROM you wish to install on your Desire S and put it on your microSD card. For this tutorial I choose Reaper v2.1 rom by lowveld.
2) You have to unlock your bootloader first via HTCdev so that you can install EXT4 recovery and custom roms. In the dropdown list select ''All other supported models'' and follow the instructions.
If you successfully finished the HTCdev unlock tutorial, your phone has a unlocked bootloader.
3) We're going to install EXT4 recovery. But first download ''4EXT_Recovery_v2.2.7_RC5.zip'' and extract the recovery.img file to the folder where you installed fastboot and adb. If you followed the tutorial in step 1 the folder will be ''C:\android-tools''
Now make sure Fast Boot is turned off on your phone. Go to ''Settings > Power > Fast Boot'' to turn it off. Unplug your phone from your computer, it's time to turn of your phone and boot into your bootloader.
Press Volume Down Button and Power Button at the same time to boot into recovery. Now connect your phone to your computer and select fastboot.
(Power button to select, Volume Down/Up to navigate)
Go to start->run-> type cmd and press enter. A command prompt will now appear.
Type:
cd c:\android-tools [press enter]
fastboot flash recovery recovery.img [press enter]
Click to expand...
Click to collapse
EXT4 recovery is now installed on your phone. Turn off your phone in bootloader menu.
4) Open the rom (.zip file) you downloaded in step 1 and put the ''boot.img'' file in ''C:\android-tools''
If you followed this tutorial correctly, you already copied your desired rom your onto your MicroSD card.
Now we boot into the bootloader again, this time we select recovery.
Go to: wipe | format>and select: wipe data/factory reset (this may take a while), then select wipe cache and wipe dalvik cache.
Go back to main menu in EXT4 recovery and select ''install from sdcard'' select ''Reaper_V2.1.ZIP''. After the rom is installed turn your phone off again.
Boot into recovery, connect your phone to your computer and select fastboot on your phone.
Go to start->run-> type cmd and press enter. A command prompt will now appear.
Type:
cd c:\android-tools [press enter]
fastboot flash boot boot.img [press enter]
Click to expand...
Click to collapse
After it's successfully installed, turn of your phone and just boot normally. It may take a while for your phone to boot up.
Your phone is unlocked,rooted and has a custom ROM.
Enjoy
Note: Some new ICS roms require different kind of HBOOT. I use Fallout v5.0.0 without any problems.
Just press the 'Thanks' button instead of saying thanks.
Changelog:
*03-03-2012 Updated guide
*14-03-2012 Updated guide
*12-09-2012 Added Notes/updated guide
Click to expand...
Click to collapse

Tx!
Was thinking about rooting/unlocking but wasnt really sure of myself doing it without bricking it. Most of this guide i already knew but it gives me confidence before making the jump
Sent from my HTC Desire S using xda premium

Why did you temp root at step 2? As soon as you restart your phone it'll be gone.

foX2delta said:
Why did you temp root at step 2? As soon as you restart your phone it'll be gone.
Click to expand...
Click to collapse
So it's not permanent? meaning step 2 is unnecessary?

@n0elite
Yeah, if your phone is locked (2. hboot) or s-on (0.98 hboot) if will just give you shell root, useful but not required for what you doing.

this looks promising, i think i'll try it someday
so i'll be root after i finished this procedure, or just temporary?

Finally. This was the missing link in this forum!
I had the intention do write one, but I am S-OFF and cannot verify the steps without going to Stock then doing the steps and then downgrade and S-OFF again. Too many things to do just in the name of a correct tutorial. Anyway thanks I am glad that somebody finally wrote it!
P. S. : please notify ben_pyett to include it in the Index thread
Sent from my Desire S using Tapatalk

foX2delta said:
@n0elite
Yeah, if your phone is locked (2. hboot) or s-on (0.98 hboot) if will just give you shell root, useful but not required for what you doing.
Click to expand...
Click to collapse
Wouldn't swapping step 2 and 3 fix that?
Sent from my HTC Desire S using xda premium

@dan-fish
Yip

Guide updated. Thanks for the comments

I've followed your Guide ... but i stuck on the bootscreen
i installed the ROM via recovery ... and then the phone restarted and started to boot, i just pulled out the battery to turn off the phone and then to flash "boot.img" via fastboot, but now i stuck on the bootscreen ... anybody knows what to do?

yxsunnyxy said:
I've followed your Guide ... but i stuck on the bootscreen
i installed the ROM via recovery ... and then the phone restarted and started to boot, i just pulled out the battery to turn off the phone and then to flash "boot.img" via fastboot, but now i stuck on the bootscreen ... anybody knows what to do?
Click to expand...
Click to collapse
Damn, where did you read to pull the battery? NEVER PULL BATTERY AT RUNNING OR BOOTING SYSTEM EXCEPT YOUR AWARE OF THE POSSIBILITY TO GET A PAPERWEIGHT AND DON'T MIND IT!!
Did really take a look at the recovery? What is written as last line?
Ok, but your phone is off now, if not reboot to bootloader with
adb reboot bootloader
at the command line.
Otherwise start it with vol down and power.
There use the fastboot command to flash the boot.img, if you're lucky it will work.
Swifted from my Desire S far away from my PC

Tectas said:
Damn, where did you read to pull the battery? NEVER PULL BATTERY AT RUNNING OR BOOTING SYSTEM EXCEPT YOUR AWARE OF THE POSSIBILITY TO GET A PAPERWEIGHT AND DON'T MIND IT!!
Did really take a look at the recovery? What is written as last line?
Ok, but your phone is off now, if not reboot to bootloader with
adb reboot bootloader
at the command line.
Otherwise start it with vol down and power.
There use the fastboot command to flash the boot.img, if you're lucky it will work.
Swifted from my Desire S far away from my PC
Click to expand...
Click to collapse
I tried it, but it will still stuck on the HTC Splash screen ...
When i'm flashing the ROM everything works and in the end it starts restarting ... and i have no chance to stop the restarting? Or i'm blind
Update: Found the solution ... noob mistake

yxsunnyxy said:
I tried it, but it will still stuck on the HTC Splash screen ...
When i'm flashing the ROM everything works and in the end it starts restarting ... and i have no chance to stop the restarting? Or i'm blind
Click to expand...
Click to collapse
What rom do you use? Maybe the recovery script forces a restart, sry, but anyways use vol down vol up and power or adb reboot bootloader to force a reboot.
If it's really needed only pull battery in between the small gap after shutdown and boot, but not at running system.
Try it the other way round, first flash the boot.img, afterwards flash the rom.
Swifted from my Desire S far away from my PC

Please help .
I am new to android and I did know a great stupidity, I removed the battery while charging the 4EXT Recovery image I thought was locked and now i do not know what to do, please teach me download it another rom as it related to furniture.

stroescu76 said:
I am new to android and I did know a great stupidity, I removed the battery while charging the 4EXT Recovery image I thought was locked and now i do not know what to do, please teach me download it another rom as it related to furniture.
Click to expand...
Click to collapse
So what is the problem? Phone doesn't boot or what?

Locked in HTC logo.
He remained in the HTC logo, and nothing happens, I would be very grateful if you help me, I think not uploaded image.: (

stroescu76 said:
He remained in the HTC logo, and nothing happens, I would be very grateful if you help me, I think not uploaded image.: (
Click to expand...
Click to collapse
What did you do before the phone wouldn't boot?

I followed your directions, I installed version Reaper_V2.1'''' I closed, I opened the phone and I gave in "Fastboot", give the command:
cd c: \ android-tools [press enter]
fastboot flash boot boot.img [press enter],
but it says "error: can not load boot.img", if I saw a video where I realize I'm wrong or my phone failed.

Put boot.img in c:\android-tools and then run the command again
Sent from my HTC Desire S using XDA

[Q] I give up, I've looked everywhere

OK, xda... I've about had it.
I have an ATT htc one x, great phone until I rooted it then tried to download jellybean on it.
Here's how it went:
Got the phone unlocked finally! YAY very happy!
Seen commercials on TV about these new HTCs having jellybean and got jealous and tired of waiting for ATT to come out with an update to run it. Decided to try to download it... didn't really understand what I was doing (stupid, I know). So I think i did everything right up until it came to "flashing" the rom. Still not quite sure what that means, but that's another story. So after I did everything, except flashing the rom, my phone rebooted... heart was pumping then BAM! HTC doesn't boot up. It's now stuck on a screen saying something about it being for developing purposes only... blah blah
So now my computer doesn't pick up the phone when I connect it, so i can't restore it. Tried just about everything that I know of:
holding power button for 14 secs
held power button and both volume buttons
held power button for 7seconds
I don't care about having contacts, data, or anything else back but being able to use my phone again
Please help me, I'm so tired of using this (notso) smart phone. Any criticism I have to face, I deserve..
Do I just have an "expensive paperweight" now?

Did you get recovery installed? If so hold power until the lights flash and the phone turns off, then press power and volume down together for a couple seconds until it boots to a screen with an option to go into recovery. Note your hboot version on this screen. Go to recovery, factory reset, wipe cache and dalvik, and flash your rom. If your boot is 1.14 you'll need to flash the boot.IMG that you find in the root of your ROM zip too.
Sent from my One X using xda app-developers app

I'm guessing not, because it doesn't even go into recovery mode.
After reading further into this section i come to realize that i'm dumb and my phone is hardbricked (my computer doesnt recognize it)... Sorry for the waste of time/thread space

Doesn't sound like a hard brick. Will it go into fastboot?
Sent from my One X using xda app-developers app

lauterm said:
Doesn't sound like a hard brick. Will it go into fastboot?
Sent from my One X using xda app-developers app
Click to expand...
Click to collapse
No, all it does is turn off and turn right back on to the htc boot screen. Charger light comes on, but not while on the htc boot screen.

Have you actually tried to go into the bootloader ?
Hold power for 6 seconds and then let go and hold volume down until it boots up
Sent from my HTC One XL using Tapatalk 2

Robmanx said:
No, all it does is turn off and turn right back on to the htc boot screen. Charger light comes on, but not while on the htc boot screen.
Click to expand...
Click to collapse
if you hold power and volume down until the phone turns off, then let go of power and continue to hold volume down, that will take you into the bootloader.
From there you can flash a recovery if you don't have it installed.
If you don't have one installed: http://techerrata.com/file/twrp2/evita/openrecovery-twrp-2.3.3.0-evita.img
and in fastboot type
fastboot flash recovery openrecovery-twrp-2.3.3.0-evita.img

Robmanx said:
No, all it does is turn off and turn right back on to the htc boot screen. Charger light comes on, but not while on the htc boot screen.
Click to expand...
Click to collapse
As soon as the phone turns off hold down the volume down button.Continue to hold it down until it comes to a white screen. From there you'll be able to get into recovery.
Edit: Do not touch the power button when it shuts off.
Sent from my Venom 1

Which rom did you flash, exactly?
Did you flash the boot.img in fastboot?

sending 'recovery' (7332 KB)... OKAY
writing 'recovery'... OKAY
Then what?
OK i did recovery on my phone and it brought me to a screen titled Team Win Recovery Project. I try to WIPE but it says that it fails. I think we're getting somewhere.

Robmanx said:
sending 'recovery' (7332 KB)... OKAY
writing 'recovery'... OKAY
Then what?
Click to expand...
Click to collapse
flash a ROM, and flash the boot.img for that rom (flash the boot.img in fastboot with fastboot flash boot boot.img)

absolutelygrim said:
flash a ROM, and flash the boot.img for that rom (flash the boot.img in fastboot with fastboot flash boot boot.img)
Click to expand...
Click to collapse
OK. is the ROM in your sig ok for ATT HTC ONEx? I'm looking to go back to stock

Robmanx said:
OK. is the ROM in your sig ok for ATT HTC ONEx? I'm looking to go back to stock
Click to expand...
Click to collapse
yea, but its not stock

absolutelygrim said:
yea, but its not stock
Click to expand...
Click to collapse
OK. Well. You just gained another Download. I hope this works
Any advice? I think I have it down now..
I know on the last ROM i did it said to extract the boot.img, or will i have to not do that? I just want to make sure i'm doing this right. DO you have IRC? we can finish there?

Robmanx said:
OK. Well. You just gained another Download. I hope this works
Any advice? I think I have it down now..
I know on the last ROM i did it said to extract the boot.img, or will i have to not do that? I just want to make sure i'm doing this right. DO you have IRC? we can finish there?
Click to expand...
Click to collapse
if you are on 1.14 or 2.14 hboot, you will need to put the boot.img in your folder with fastboot.exe, put your phone into fastboot USB, and type "fastboot flash boot boot.img" and then go into recovery, flash the ROM, and good to go.
You will need to do this when changing ROMs or, if the kernel changes. Unless you downgrade your hboot, which I don't recommend for people without linux knowledge

absolutelygrim said:
if you are on 1.14 or 2.14 hboot, you will need to put the boot.img in your folder with fastboot.exe, put your phone into fastboot USB, and type "fastboot flash boot boot.img" and then go into recovery, flash the ROM, and good to go.
You will need to do this when changing ROMs or, if the kernel changes. Unless you downgrade your hboot, which I don't recommend for people without linux knowledge
Click to expand...
Click to collapse
Ok. Thanks. What's the gapps for? Do I extract that into the folder with adb and my fastboot?
Just want to be clear on the evita, I just extract the boot.img, not the whole thing right?

Robmanx said:
Ok. Thanks. What's the gapps for? Do I extract that into the folder with adb and my fastboot?
Just want to be clear on the evita, I just extract the boot.img, not the whole thing right?
Click to expand...
Click to collapse
just the boot.img
and gapps are google apps, like play store, gmail, maps, etc. Flash it in recovery

absolutelygrim said:
just the boot.img
and gapps are google apps, like play store, gmail, maps, etc. Flash it in recovery
Click to expand...
Click to collapse
OK i'm in recovery. Tried to backup but it isnt letting me. In the log it's saying unable to mount SD card and storage.
thanks for all this

Make sure the sdcard isn't mounted to your computer anymore
Sent from my HTC One XL using xda app-developers app

Ugh.. nothing is mounted to my computer... Could it be a permissions problem? Nothing is going my way:/

[Q] Stuck after flashing boot.img

I'm on 2.20, was trying to get to CM10.1. Following instructions in this thread:
http://forum.xda-developers.com/showthread.php?t=1952076
Got to this point: "If you have the newer HBOOT 1.14 (you probably do if coming from stock 2.20), boot.img's will have to be flashed separately via fastboot. Extract the boot.img from you ROM zip of choice and put it in the same directory as fastboot. Reboot your device into boot loader and run "'fastboot flash boot boot.img' (no quotes)
You can then flash the ROM and gapps via recovery and reboot and enjoy."
I followed hasoon2000's advice that his all-in-one tool could flash boot.img for me. I grabbed boot.img from the cm zip, followed instructions to flash boot.img, all appeared good, however now I can't get to TWRP to flash CM. No matter what I do, when the phone boots to the screen with the red text, sits there for a while, and boot loops. The all-in-one tool can no longer detect any device connected to my computer. Any great advice out there or am I toast?

GabbleRatchet said:
I'm on 2.20, was trying to get to CM10.1. Following instructions in this thread:
http://forum.xda-developers.com/showthread.php?t=1952076
Got to this point: "If you have the newer HBOOT 1.14 (you probably do if coming from stock 2.20), boot.img's will have to be flashed separately via fastboot. Extract the boot.img from you ROM zip of choice and put it in the same directory as fastboot. Reboot your device into boot loader and run "'fastboot flash boot boot.img' (no quotes)
You can then flash the ROM and gapps via recovery and reboot and enjoy."
I followed hasoon2000's advice that his all-in-one tool could flash boot.img for me. I grabbed boot.img from the cm zip, followed instructions to flash boot.img, all appeared good, however now I can't get to TWRP to flash CM. No matter what I do, when the phone boots to the screen with the red text, sits there for a while, and boot loops. The all-in-one tool can no longer detect any device connected to my computer. Any great advice out there or am I toast?
Click to expand...
Click to collapse
Did you flash the zip file also or just the boot image?
AT&T HTC OneX
Android 4.1.1
ViperXL

Venomtester said:
Did you flash the zip file also or just the boot image?
AT&T HTC OneX
Android 4.1.1
ViperXL
Click to expand...
Click to collapse
I cant get into recovery to flash the zip

Turn on, hold power 10-15 seconds, until screen goes black, let off, press n hold volume down, press power just 2-3 seconds, let off power button but continue holding vol. Down
Remember to do a faxtory reset before flashing the zip

a box of kittens said:
Turn on, hold power 10-15 seconds, until screen goes black, let off, press n hold volume down, press power just 2-3 seconds, let off power button but continue holding vol. Down
Remember to do a faxtory reset before flashing the zip
Click to expand...
Click to collapse
Fantastic. I knew there had to be a key sequence somewhere. Thanks a million!

I'm assuming you've already tried "fastboot reboot bootloader" or "fastboot reboot recovery"?
ADB commands won't work right now for you I don't think

KitWasHere said:
I'm assuming you've already tried "fastboot reboot bootloader" or "fastboot reboot recovery"?
ADB commands won't work right now for you I don't think
Click to expand...
Click to collapse
....? He would need to be in Fastboot mode from bootloader and I'd he was in bootloader he would not have posted here and no adb wouldn't work...neither would Fastboot if I was in a bootloop

Use this to flash boot.imgs cool tool
http://forum.xda-developers.com/showthread.php?t=1962428
sent from my HTC One X
Unlocked & rooted 2.20 bounty baby
Sweet potatoe pie

If you can get into download mode, use odin and reflash back to stock
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

MRxxEGO said:
If you can get into download mode, use odin and reflash back to stock
Sent from my SAMSUNG-SGH-I747 using xda app-developers app
Click to expand...
Click to collapse
Lol don't encourage him to use Odin for an HTC device .. this isn't samsung it's not supported on htc!!!!

Lol true true true
Sent from my SAMSUNG-SGH-I747 using xda app-developers app

[Q] Super Soft Brick, can anyone help me unbrick this device.

Today I unlocked my HOX using Hasoon2000's all in one kit. Unlocked the phone, super cid 1111111111, and rooted the phone with no problems. Once i got everything completed i attempted to install Viper XL rom onto the device through TWRP. The first time it froze during the process, so I rebooted and repeated the process. However, once i got it to work through TWRP, it started to boot up with the Viper XL boot screen and then suddenly turn off, and repeat itself. I can't get into boot loader and once plugged into my pc it simply makes the connect and disconnect sounds. Please any help at to unbrick this phone would be highly appreciated...

Have you tried flashing a different ROM?
If it's continually looping when trying to boot, hover your finger over the volume down button, then press and hold it as soon as the screen goes blank. Hopefully that'll get you into bootloader.
Sent from my Evita

dopedbadger said:
Today I unlocked my HOX using Hasoon2000's all in one kit. Unlocked the phone, super cid 1111111111, and rooted the phone with no problems. Once i got everything completed i attempted to install Viper XL rom onto the device through TWRP. The first time it froze during the process, so I rebooted and repeated the process. However, once i got it to work through TWRP, it started to boot up with the Viper XL boot screen and then suddenly turn off, and repeat itself. I can't get into boot loader and once plugged into my pc it simply makes the connect and disconnect sounds. Please any help at to unbrick this phone would be highly appreciated...
Click to expand...
Click to collapse
XDA Rules = Search before posting. This issue has been answered a million times.
That being said, while I would prefer you would help yourself a bit since you were smart enough to get yourself into this mess, I will still help you.
You are currently S-ON?
What hboot?
What version of TWRP are you using?
The phone still turns on right? bootloops?
It's not just black screen?
BAH TIMMAAA BEAT ME TO IT!

timmaaa said:
Have you tried flashing a different ROM?
Sent from my Evita
Click to expand...
Click to collapse
I can't. I'm stuck in a boot loop, where the device continuously reboots on it's own. Can't get to fastboot or the bootloader. Device isn't being found through the adb since it powers off before it can be recognized.

dopedbadger said:
I can't. I'm stuck in a boot loop, where the device continuously reboots on it's own. Can't get to fastboot or the bootloader. Device isn't being found through the adb since it powers off before it can be recognized.
Click to expand...
Click to collapse
If the phone turns on, you can get into bootloader.
As soon as the HTC screen comes back on press and hold power until the screen goes black. When the screen goes black, let go of power and press and hold volume down until the bootloader comes up.

exad said:
XDA Rules = Search before posting. This issue has been answered a million times.
That being said, while I would prefer you would help yourself a bit since you were smart enough to get yourself into this mess, I will still help you.
You are currently S-ON?
What hboot?
What version of TWRP are you using?
The phone still turns on right? bootloops?
It's not just black screen?
BAH TIMMAAA BEAT ME TO IT!
Click to expand...
Click to collapse
I actually did attempt searching through the forums, but i could not find a thread that actually helped me in my current predicament.
I am currently still S- ON, my firmware was the latest 3.18, the version of TWRP used was 2.5.0. and yes the phone still turns on, however it's doing it automatically by itself into a constant bootloop from the HTC white screen to the Viper XL boot animation.

exad said:
If the phone turns on, you can get into bootloader.
As soon as the HTC screen comes back on press and hold power until the screen goes black. When the screen goes black, let go of power and press and hold volume down until the bootloader comes up.
Click to expand...
Click to collapse
Alright, i was just having issues with my timing of trying to enter into bootloader. I'm currently sitting on the bootloader. fastboot however returns me to my eternal bootloop.

dopedbadger said:
Alright, i was just having issues with my timing of trying to enter into bootloader. I'm currently sitting on the bootloader. fastboot however returns me to my eternal bootloop.
Click to expand...
Click to collapse
Enter bootloader with the phone hooked up to PC, it should automatically put u you fastboot USB
Download twrp 2.3.3.1
check md5
flash twrp 2.3.3.1
fastboot erase cache
reboot to bootloader again fastboot reboot bootloader
select recovery wipe everything flash a sense rom.
If you're s-off fastboot flash boot boot.img extracted from the rom your flashing. GL HF. this phone has many quirks. Please read stickies for more info.

exad said:
Enter bootloader with the phone hooked up to PC, it should automatically put u you fastboot USB
Download twrp 2.3.3.1
check md5
flash twrp 2.3.3.1
fastboot erase cache
reboot to bootloader again fastboot reboot bootloader
select recovery wipe everything flash a sense rom.
If you're s-off fastboot flash boot boot.img extracted from the rom your flashing. GL HF. this phone has many quirks. Please read stickies for more info.
Click to expand...
Click to collapse
I can't seem to get my computer to recognize the phone when i plug it in. it makes the sound saying its connected, but it's just not displaying. Can't flash anything unless pc finds the device.

Sometimes it takes time and a couple unplug replugs for fastboot USB to come up. Took me almost a minute for it to connect properly for me earlier today.
Sent from my One X using xda app-developers app

exad said:
Sometimes it takes time and a couple unplug replugs for fastboot USB to come up. Took me almost a minute for it to connect properly for me earlier today.
Sent from my One X using xda app-developers app
Click to expand...
Click to collapse
I can't get it to recognize the phone. the fastboot usb option show whenever i plug into a pc. however, neither my desktop or laptop will recognize the phone..already reinstalled htc drivers and adb drivers

So it says fast boot USB?
What happens when you do fastboot devices?
Sent from my One X using xda app-developers app

exad said:
So it says fast boot USB?
What happens when you do fastboot devices?
Sent from my One X using xda app-developers app
Click to expand...
Click to collapse
It says fast boot on the phone in bootloader. if i reboot in fastboot, it just sends me to my bootloop. Man, i wish i would've just stopped i got this thing rooted.

While 2.3.5 of TWRP i reinstalled the Viper XL on my sd card, for the fourth time. Out of desperateness. But it actually booted up completely. Seems as if everything is working as well. Thanks man for everything.

[Q] Bootloader stuck with no adb access.

Hi All,
I think I may have bricked my htc sensation, I tried to install JellyBean 4.3 rom as described here. techbeasts.com/2013/11/08/how-to-install-android-4-3-jelly-bean-on-htc-sensation-sensation-xe
Basically, I copied all the files into the sdcard then run fastboot flash boot boot.img after that when did fastboot reboot the bootloader got stuck in loading and when I try to connect using adb i get the device offline message.
I believe with 4.2 or above you have to accept RSA warning or sometime in order to connect using adb tool but I cannot do that as it's stuck on bootloader.
Looks like I've managed to brick the phone as I don't see any way out? just want to confirm that's the case.
This is my first post, please be gentle

I'm now getting this message : error: device unauthorized. Please check the confirmation dialog on your device.

Hi;
There's no adb command while in fasboot mode. Either adb, or fasboot.
When you entered the command to flash the kernel, was it successful? Did it not give any error messages
What iss your firmware? Install the latest official ICS RUU first, then install a recovery, go into recovery and wipe partitions: data, system, and cache. Afterwards, without rebooting, install the 4.3 ROM you want (which I do not suggest) then go back into fastboot mode and flash the 4.3 ROM's kernel. (flash boot boot.img)
Where do you get the last message?
*By the way, for this kind of actions, let XDA be your first consideration to go, I recommend.*
SENT FROM WHATEVER IS NOT SOMETHING TO BE LOCKED AT, THE THING IS THAT IT IS SENT.

Thanks for your reply, I can't get to fastboot using power button + volume key so I'll trying to use adb.

huzzi said:
Thanks for your reply, I can't get to fastboot using power button + volume key so I'll trying to use adb.
Click to expand...
Click to collapse
Eject you battery that try volume down + power button
Sent from my HTC Sensation 4G using xda app-developers app

huzzi said:
Thanks for your reply, I can't get to fastboot using power button + volume key so I'll trying to use adb.
Click to expand...
Click to collapse
Remove and re-insert the battery he means, not when the phone has no battery in it.
Mile_zdr said:
Eject you battery that try volume down + power button
Sent from my HTC Sensation 4G using xda app-developers app
Click to expand...
Click to collapse
SENT FROM WHATEVER IS NOT SOMETHING TO BE LOCKED AT, THE THING IS THAT IT IS SENT.

My + volume does not work

ashkan-khatar said:
Remove and re-insert the battery he means, not when the phone has no battery in it.
SENT FROM WHATEVER IS NOT SOMETHING TO BE LOCKED AT, THE THING IS THAT IT IS SENT.
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huzzi said:
My + volume does not work
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Yeah my bad remove and reinsert battery.. than press and hold together volume down and power button