Database Users

ZTE Open C (US) - brand new, bootloader won't unlock, rooted terminal?

just got the device today
followed the tutorial on unlocking the bootloader using the comebuy upgrade tool and checked the box for erasing "CEFS" and upgraded the firmware.
shell is now rooted.
however, rebooting to bootloader and trying any fastboot command gets "waiting for device"; fastboot devices shows nothing.
wth???
i'm an experienced dev / user, but i'm not going to be happy if this device i just got for developing purposes is locked down to where i can't do that.
also, trying to install the FFOS_to_android.zip that's widely available also does not pass signature verification in the recovery...
anyone got any ideas how i can unlock this thing???

stayboogy said:
just got the device today
followed the tutorial on unlocking the bootloader using the comebuy upgrade tool and checked the box for erasing "CEFS" and upgraded the firmware.
shell is now rooted.
however, rebooting to bootloader and trying any fastboot command gets "waiting for device"; fastboot devices shows nothing.
wth???
i'm an experienced dev / user, but i'm not going to be happy if this device i just got for developing purposes is locked down to where i can't do that.
also, trying to install the FFOS_to_android.zip that's widely available also does not pass signature verification in the recovery...
anyone got any ideas how i can unlock this thing???
Click to expand...
Click to collapse
If you google "fastboot command gets "waiting for device"; you may find your answer, most likely driver problem, I use Linux so drivers aren't necessary for me.

vampirefo said:
If you google "fastboot command gets "waiting for device"; you may find your answer, most likely driver problem, I use Linux so drivers aren't necessary for me.
Click to expand...
Click to collapse
i got it figured out. i use both linux and windows; mainly linux. in linux fastboot was acting the same way. it's not now. still have to use sudo though...
i had to dd your recovery, then rebooted to bootloader and ran fastboot oem unlock and it was done.
i was initially very frustrated though.
since i got that figured out i've been trying to port my touchnav recovery to the device but i've been getting an error when i try to fastboot boot it.
funny you replied cause i'm curious what you're using to build your recovery. are you just using the last jb repo or something newer?

stayboogy said:
i got it figured out. i use both linux and windows; mainly linux. in linux fastboot was acting the same way. it's not now. still have to use sudo though...
i had to dd your recovery, then rebooted to bootloader and ran fastboot oem unlock and it was done.
i was initially very frustrated though.
since i got that figured out i've been trying to port my touchnav recovery to the device but i've been getting an error when i try to fastboot boot it.
funny you replied cause i'm curious what you're using to build your recovery. are you just using the last jb repo or something newer?
Click to expand...
Click to collapse
In Linux you need to make user rules if you don't want to use sudo to fastboot, my .50 recovery is a straight pull from CyanogenMod's 4.4 tree.
other recovery straight pull from CyanogenMod's 4.3 tree

[SOLVED] Z1 not showing up in Linux ADB devices

hi,
trying to flash the breadcrust recovery using my linux pc, but the Z1 doesn't appear in the list of devices when running adb devices. Image attached. Normally I would get a request to accept the RSA key for a trusted pc when enabling usb debug. But I don't get this option.
- Adb tools are loaded and working on my linux laptop
- My nexus 7 responds to ADB devices and shows up ok
- tried on wifes windows laptop with adb/sdk tools loaded and no joy there too
- i have developer USB debug options enabled, i've tripple checked this
could it be the cable? I'm using the one which came with the phone, so that should be ok?!!
cheers
SOLUTION - I ran this One Plus Two script modified with the Z1 device ID and now I can see my device in adb devices and interact with it. I get the SHA screen to allow access and can run commands from linux terminal. YAY!
See the attachments for script.

I think it´s a driver fault. Did u install them in windows?

im using linux, i dont get any rsa pop up confirmation either!

EggZenBeanz said:
im using linux, i dont get any rsa pop up confirmation either!
Click to expand...
Click to collapse
and that was the reason, why i installed windows last night. as long you dont get rsa pop up, the device will not listed (i think so)

EggZenBeanz said:
im using linux, i dont get any rsa pop up confirmation either!
Click to expand...
Click to collapse
But u said, that u tried ur wifes Windows notebook. Did u install the drivers there?

ADB doesn't work for me, too. I work around this problem by booting into recovery (simultaneously press Vol+ and Vol- and Power until phone vibrates) and choose "Boot to bootloader" from there. After rooting I installed "Power Toggles" from Play Store and use the toggle to reboot to recovery or bootloader.
By the way, when I boot into recovery, I'm able to ADB sideload. So I don't think there's a driver issue.

MKKLR21 said:
ADB doesn't work for me, too. I work around this problem by booting into recovery (simultaneously press Vol+ and Vol- and Power until phone vibrates) and choose "Boot to bootloader" from there. After rooting I installed "Power Toggles" from Play Store and use the toggle to reboot to recovery or bootloader.
By the way, when I boot into recovery, I'm able to ADB sideload. So I don't think there's a driver issue.
Click to expand...
Click to collapse
Good tip - I'll give it a go.
My nexus 7 works as expected on all PCs and laptops Linux/windows so it must be the phone
Sent from my Nexus 7 using Tapatalk

Maybe sudo or check this:
http://1.bp.blogspot.com/-rDdBnJTh870/U-hxVzxMf3I/AAAAAAAAKwQ/WrZkaMjaReo/s1600/Unlock-Bootloader-linux-terminal-xperia-z.png[img/]
Source: [url]http://linuxwelt.blogspot.de/2014/08/cyanogenmod-unter-linux-installieren.html[/url]

ok some progress.....
got the trusted device RSA screen to appear on my wifes windows pc. i could then run adb devices and see the device.
I could run adb reboot bootloader, but the device doesn't boot into fastboot, just reboots as normal!
I could also hold down up/down volume buttons and get into the bootloader, but again the device isn't picked by any fastboot oem checks for unlocking!!
arrrgh!!!

You'll have to add -i switch followed by the device ID to your fastboot command. I don't have it at hand, so just read the TWRP thread.

ok! Some progress...ish.
running "adb reboot bootloader"command in windows worked when I switched Cyanogen recovery updates off in developer options. The Z1 reboots into bootloader.
Running "fastboot -i 0x2b4c oem get-device-info" returns nothing just "....."
So I tried "fastboot -i 0x2b4c oem unlock" an error returns cannot unlock use command "fastboot -i 0x2b4c oem unlock-go" which works. The phone wipes data and reboots back into OS.
I re-enable the developer options and adb debug. and reboot into bootloader
Run "fastboot -i 0x2b4c flash recovery z1.twrp.2.8.7.0.By.Breadcrust-UPDATE3.img" - some time stats are retunred and OKAY message. But when I boot into recovery it's still the cyanogen stock recovery. not TWRP.
weird!

Your commands are simply wrong, thats why they don´t work.
It is:
fastboot -i 0x2b4c oem device-info
fastboot -i 0x2b4c oem unlock-go
Run "fastboot -i 0x2b4c flash recovery z1.twrp.2.8.7.0.By.Breadcrust-UPDATE3.img" - some time stats are retunred and OKAY message. But when I boot into recovery it's still the cyanogen stock recovery. not TWRP.
Click to expand...
Click to collapse
Flashing does NOT work on the international version, you have to boot into it directly from fastboot.
fastboot -i 0x2b4c boot z1.twrp.2.8.7.0.By.Breadcrust-UPDATE3.img
Should be correct instead of the flash command.

EggZenBeanz said:
ok some progress.....
got the trusted device RSA screen to appear on my wifes windows pc. i could then run adb devices and see the device.
I could run adb reboot bootloader...
...
Click to expand...
Click to collapse
What made the change? I was able to see the RSA screen only once, but after device restored to defaults I can't get it back. same drivers installed, and it appears in the device manager.

I honestly don't know, it just worked after many attempts. I read somewhere about USB 3 ports with Linux so might be the same for windows?
Sent from my Z1 using Tapatalk

It's an USB 3.0 issue. Plug the phone into an USB 2.0 port, or an USB 2.0 hub plugged into an USB 3.0 port and it will magically start working. God knows why this is the case...
Ironically, fastboot works fine even on USB 3.0...

For to be able to boot (not flash) the TWRP recovery you shouldn't need to unlock bootloader. Am I right?

Planet X said:
For to be able to boot (not flash) the TWRP recovery you shouldn't need to unlock bootloader. Am I right?
Click to expand...
Click to collapse
Booting should work.
At least it worked fine on other fastboot capable devices I've had in the past.

MrColdbird said:
Booting should work.
At least it worked fine on other fastboot capable devices I've had in the past.
Click to expand...
Click to collapse
Okay, I have found out that it is impossible to boot from TWRP as log as the bootloader is locked. It just took me 2 hours to setup my phone again after unlock.

Have a look at this thread, I am going to give it a try later.
http://forum.xda-developers.com/showthread.php?t=2408802

This did the trick on Linux (Ubuntu):
- run on terminal "sudo gedit ~/.android/adb_usb.ini"
- put "0x2b4c" in
- run on terminal "adb kill-server" and "adb start-server"
And run the fastboot commands with "sudo".

No Fastboot Option In Bootloader

I restarted my phone this evening, and when it booted up I got a "decryption unsuccessful" message. When that happens it appears my only option is to flash a factory image. So I download the most recent image, and when I get into the bootloader I see no option for fastboot.
When I'm in TWRP (3.0.2-0) I can see my phone listed in recovery or sideload when I run "adb devices" from my computer, but no devices are listed when the command is run while on the main bootloader screen.
Not sure if it matters at this point, but I had the 20160821 Pure Nexus build installed when this happened.
How do I get my phone into fastboot mode so I can flash the factory image?
Thanks so much for your help.

It sounds like you may not have the latest drivers for the Android SDK or ADB toolkit.

RonaldusMagnus said:
I restarted my phone this evening, and when it booted up I got a "decryption unsuccessful" message. When that happens it appears my only option is to flash a factory image. So I download the most recent image, and when I get into the bootloader I see no option for fastboot.
When I'm in TWRP (3.0.2-0) I can see my phone listed in recovery or sideload when I run "adb devices" from my computer, but no devices are listed when the command is run while on the main bootloader screen.
Not sure if it matters at this point, but I had the 20160821 Pure Nexus build installed when this happened.
How do I get my phone into fastboot mode so I can flash the factory image?
Thanks so much for your help.
Click to expand...
Click to collapse
When you are in bootloader, you can use fastboot commands.

RonaldusMagnus said:
I restarted my phone this evening, and when it booted up I got a "decryption unsuccessful" message. When that happens it appears my only option is to flash a factory image. So I download the most recent image, and when I get into the bootloader I see no option for fastboot.
When I'm in TWRP (3.0.2-0) I can see my phone listed in recovery or sideload when I run "adb devices" from my computer, but no devices are listed when the command is run while on the main bootloader screen.
Not sure if it matters at this point, but I had the 20160821 Pure Nexus build installed when this happened.
How do I get my phone into fastboot mode so I can flash the factory image?
Thanks so much for your help.
Click to expand...
Click to collapse
Not sure what you're talking about. Turn the phone off. Hold vol down + power, to boot into the bootloader / fastboot.
Run the fastboot devices command, and you should see your device. That's where you can flash your system images.

JustPlayingHard said:
When you are in bootloader, you can use fastboot commands.
Click to expand...
Click to collapse
So, if I'm at the bootloader's main screen, I should be able to see my device when I run the command "adb fastboot devices", right? Cuz that's not happening. Also, when I use the volume rocker to see the available options fastboot isn't listed.
When I go into recovery from the bootloader and run the command "adb devices" I see my device listed with "recovery" next to it. When I launch ADB sideload from TWRP, I also see my device listed with "sideload" next to it.
So, I can run fastboot commands when I'm in the bootloader even if "adb fastboot devices" returns nothing?

RonaldusMagnus said:
So, if I'm at the bootloader's main screen, I should be able to see my device when I run the command "adb fastboot devices", right? Cuz that's not happening. Also, when I use the volume rocker to see the available options fastboot isn't listed.
When I go into recovery from the bootloader and run the command "adb devices" I see my device listed with "recovery" next to it. When I launch ADB sideload from TWRP, I also see my device listed with "sideload" next to it.
So, I can run fastboot commands when I'm in the bootloader even if "adb fastboot devices" returns nothing?
Click to expand...
Click to collapse
It's not adb fastboot.. It's just fastboot.

teh roxxorz said:
Not sure what you're talking about. Turn the phone off. Hold vol down + power, to boot into the bootloader / fastboot.
Run the fastboot devices command, and you should see your device. That's where you can flash your system images.
Click to expand...
Click to collapse
The problem I have is that when I'm in the bootloader (at the screen with the android robot on its back) and use the volume rocker to see the available options, fastboot isn't listed as an option to select.
Sent from my FIND7 using XDA-Developers mobile app

RonaldusMagnus said:
The problem I have is that when I'm in the bootloader (at the screen with the android robot on its back) and use the volume rocker to see the available options, fastboot isn't listed as an option to select.
Sent from my FIND7 using XDA-Developers mobile app
Click to expand...
Click to collapse
It's literally, stay in bootloader
type: "fastboot devices" and you should see your device.

JustPlayingHard said:
It's literally, stay in bootloader
type: "fastboot devices" and you should see your device.
Click to expand...
Click to collapse
Thanks. I'll do as you said and report back. Maybe what I'm doing wrong is recalling the bootloader unlock procedures where "adb" precedes some of the commands when executing them from the Windows command prompt.
Just to be ridiculously clear it's:
1. While unplugged, Power + Volume Down to enter the bootloader.
2. Once in the bootloader connect USB cable.
3. Navigate to the SDK platform-tools folder, and from the Windows command prompt execute "fastboot devices". Then I should see my device listed.
Sorry if I'm being dense.

RonaldusMagnus said:
Thanks. I'll do as you said and report back. Maybe what I'm doing wrong is recalling the bootloader unlock procedures where "adb" precedes some of the commands when executing them from the Windows command prompt.
Just to be ridiculously clear it's:
1. While unplugged, Power + Volume Down to enter the bootloader.
2. Once in the bootloader connect USB cable.
3. Navigate to the SDK platform-tools folder, and from the Windows command prompt execute "fastboot devices". Then I should see my device listed.
Sorry if I'm being dense.
Click to expand...
Click to collapse
No worries, it's probably me that's being dense.
That should work fine

RonaldusMagnus said:
Thanks. I'll do as you said and report back. Maybe what I'm doing wrong is recalling the bootloader unlock procedures where "adb" precedes some of the commands when executing them from the Windows command prompt.
Just to be ridiculously clear it's:
1. While unplugged, Power + Volume Down to enter the bootloader.
2. Once in the bootloader connect USB cable.
3. Navigate to the SDK platform-tools folder, and from the Windows command prompt execute "fastboot devices". Then I should see my device listed.
Sorry if I'm being dense.
Click to expand...
Click to collapse
or plug your phone in (while its booted normally, into its OS)
type: adb reboot bootloader
once phone reboots to bootloader, type: fastboot devices

He must have came from a HTC bc he's looking for the option Fastboot in Bootloader.
Sent from my Nexus 6P using Tapatalk

Thanks for your help everyone. I'm back up and running now. My problems stemmed from a misunderstanding that once in the bootloader I'm already able to execute fastboot commands and didn't need to select a fastboot option from the bootloader. And I had a misunderstood how to execute the fastboot commands from the command prompt.
Many thanks to everyone setting me straight!

Can't flash factory image : waiting for device

Hi, I've my new essential.
I can't flash a factory image, my device is dectected in fastboot, I have unlocked the bootloader, but when I click on flash-all in the image files, I have "waiting for device". I can't understand why because ALL OTHER COMMANDS have worked : fasboot flashing unlock, USB debugging, fastboot devices...
What can I do ? (In the control panel, device is detected without a yellow mark or something else. Everything should be fine.

basongwe said:
Hi, I've my new essential.
I can't flash a factory image, my device is dectected in fastboot, I have unlocked the bootloader, but when I click on flash-all in the image files, I have "waiting for device". I can't understand why because ALL OTHER COMMANDS have worked : fasboot flashing unlock, USB debugging, fastboot devices...
What can I do ? (In the control panel, device is detected without a yellow mark or something else. Everything should be fine.
Click to expand...
Click to collapse
Still seems like a driver issue. While in bootloader, you could confirm this by trying the command "fastboot devices". If nothing shows then check your device manager. If you are seeing Mata, it's your issue. For some reason every few times I plug in, it'll default back to that and have to manually update the driver to the bootloader driver. Just choose from list of installed drivers as the update method.

Also, if you have USB 2 ports, try one of those. I couldn't get anything to flash when I had it plugged in one of my USB 3 ports.

Could be cable issue, USB port issue, driver issue or you can try updating your adb setup etc... I used the Minimal ADB and Fastboot. Mine was out of date and wouldn't recognize device in fastboot after the Oreo sideload.
Works perfectly with the Essential official drivers in Win8.1Pro now.

The cable is brand new by anker, and works perfectly. Drivers and adb are updated.

mrcooter said:
Still seems like a driver issue. While in bootloader, you could confirm this by trying the command "fastboot devices". If nothing shows then check your device manager. If you are seeing Mata, it's your issue. For some reason every few times I plug in, it'll default back to that and have to manually update the driver to the bootloader driver. Just choose from list of installed drivers as the update method.
Click to expand...
Click to collapse
and fastboot devices works properly. But i've noticed that I wanna flash the same build that I had, maybe that ?

basongwe said:
and fastboot devices works properly. But i've noticed that I wanna flash the same build that I had, maybe that ?
Click to expand...
Click to collapse
Something that was odd that may help (assumed it was just my environment setup). I had adb installed to C:\adb and only way fastboot will work consistently for me is to run commands from that directory. Could be unrelated but thought I would mention it.

basongwe said:
Hi, I've my new essential.
I can't flash a factory image, my device is dectected in fastboot, I have unlocked the bootloader, but when I click on flash-all in the image files, I have "waiting for device". I can't understand why because ALL OTHER COMMANDS have worked : fasboot flashing unlock, USB debugging, fastboot devices...
What can I do ? (In the control panel, device is detected without a yellow mark or something else. Everything should be fine.
Click to expand...
Click to collapse
Try copying fastboot to the folder that has the flash all.bat

What operating system?

Where did you get your driver's?
Reason I ask is at first I had driver's auto install from a Samsung device that I used previously. Caused an issue where it wouldn't start the fastboot process and device got stuck at first step.

Take the system driver of your operating system from essential homepage... Was the trick for me
Link: https://www.essential.com/developer/current-builds

vergilbt said:
Take the system driver of your operating system from essential homepage... Was the trick for me
Link: https://www.essential.com/developer/current-builds
Click to expand...
Click to collapse
This also did the trick for me

You're welcome...

Edit : I have it(drivers from essential website)

Try "fastboot -i 0x2e17 <whatever command here>" it worked for me I wasn't able to unlock my bootloader until I found that command in a random website.

723i said:
Try "fastboot -i 0x2e17 <whatever command here>" it worked for me I wasn't able to unlock my bootloader until I found that command in a random website.
Click to expand...
Click to collapse
That did the trick.

723i said:
Try "fastboot -i 0x2e17 <whatever command here>" it worked for me I wasn't able to unlock my bootloader until I found that command in a random website.
Click to expand...
Click to collapse
command result: "fastboot: unknown option -- i"
not worked for me
mine is on the latest pie update

un1ocked said:
command result: "fastboot: unknown option -- i"
not worked for me
mine is on the latest pie update
Click to expand...
Click to collapse
It's always recommended to use the adb/fastboot provided by Essential (gets installed along with the Windows driver). From the error message, it looks like you are using a different fastboot executable. If you have more than one adb/fastboot package installed on your PC, make sure to use the one from Essential. You can see the path to the executable by running "fastboot --version".

kt-Froggy said:
It's always recommended to use the adb/fastboot provided by Essential (gets installed along with the Windows driver). From the error message, it looks like you are using a different fastboot executable. If you have more than one adb/fastboot package installed on your PC, make sure to use the one from Essential. You can see the path to the executable by running "fastboot --version".
Click to expand...
Click to collapse
fastboot version 28.0.3-5475833
Installed as C:\Program Files (x86)\Essential\ADB\fastboot.exe
EDIT:
problem solved by switching to an old PC with a pure usb 2.0 port

un1ocked said:
problem solved by switching to an old PC with a pure usb 2.0 port
Click to expand...
Click to collapse
Ahh... Yeah, that's often the issue. Still doesn't make a lot of sense to me, because your error msg was "unsupported option". Well, good that it worked for you.

Fastboot help

I have recently unlocked the bootloader on the Note 7 with success and want to install a custom ROM. But the problem I'm facing is that whenever the phone is in fastboot mode, running the "adb devices" command, the phone doesn't show up at all. When the phone is booted into MIUI with USB Debug enabled, the phone is listed. I have tried multiple computers, the stock USB cable, multiple USB ports, resetting the phone but the phone just will not show up on the "adb devices" list when it's in fastboot. Any suggestions on what to do next? I really want to install a custom ROM and root, etc....

BlackHawk580 said:
I have recently unlocked the bootloader on the Note 7 with success and want to install a custom ROM. But the problem I'm facing is that whenever the phone is in fastboot mode, running the "adb devices" command, the phone doesn't show up at all. When the phone is booted into MIUI with USB Debug enabled, the phone is listed. I have tried multiple computers, the stock USB cable, multiple USB ports, resetting the phone but the phone just will not show up on the "adb devices" list when it's in fastboot. Any suggestions on what to do next? I really want to install a custom ROM and root, etc....
Click to expand...
Click to collapse
try to reinstall the adb drivers on your pc. You can also install a twrp recovery so you can flash roms, root or whatever you want even from your phone

_NikO_ said:
try to reinstall the adb drivers on your pc. You can also install a twrp recovery so you can flash roms, root or whatever you want even from your phone
Click to expand...
Click to collapse
I've done that too, I've downgraded ADB Drivers as well and nothing has worked. Also, I can't install TWRP if the phone doesn't even show up on my computer to flash the custom recovery

BlackHawk580 said:
I've done that too, I've downgraded ADB Drivers as well and nothing has worked. Also, I can't install TWRP if the phone doesn't even show up on my computer to flash the custom recovery
Click to expand...
Click to collapse
Has your pc got windows 10?
---------- Post added at 08:19 AM ---------- Previous post was at 08:13 AM ----------
BlackHawk580 said:
I've done that too, I've downgraded ADB Drivers as well and nothing has worked. Also, I can't install TWRP if the phone doesn't even show up on my computer to flash the custom recovery
Click to expand...
Click to collapse
Go in Device Manager in your pc and look for "ADB Interface". If there isnt your android device then you havent installed drivers properly so go check

_NikO_ said:
Has your pc got windows 10?
---------- Post added at 08:19 AM ---------- Previous post was at 08:13 AM ----------
Go in Device Manager in your pc and look for "ADB Interface". If there isnt your android device then you havent installed drivers properly so go check
Click to expand...
Click to collapse
Yes, I've done that too, I've tried installing various different drivers as well, it also has Windows 10 as well

BlackHawk580 said:
Yes, I've done that too, I've tried installing various different drivers as well
Click to expand...
Click to collapse
So your phone is showing up in Adb devuces without any yellow warning or anything?

_NikO_ said:
So your phone is showing up in Adb devuces without any yellow warning or anything?
Click to expand...
Click to collapse
It doesn't show up at all on the list, yeah

BlackHawk580 said:
I'm facing is that whenever the phone is in fastboot mode, running the "adb devices" command, the phone doesn't show up at all.
Click to expand...
Click to collapse
Isn't that intended? You should use fastboot commands, not ADB commands...
What is the output of
Code:
fastboot devices
?

BlackHawk580 said:
It doesn't show up at all on the list, yeah
Click to expand...
Click to collapse
If there isnt your computer isnt actually seeing it as an adb device

osd_daedalus said:
Isn't that intended? You should use fastboot commands, not ADB commands...
What is the output of
Code:
fastboot devices
?
Click to expand...
Click to collapse
Okay so, I ran that command and it does show up in the list thankfully. But now I have another problem. I can't boot into the recovery. I try the fasboot boot command and it just restarts normally and for some reason, doing volume up and power doesn't enter the recovery either.

BlackHawk580 said:
Isn't that intended? You should use fastboot commands, not ADB commands...
What is the output of
Okay so, I ran that command and it does show up in the list thankfully. But now I have another problem. I can't boot into the recovery. I try the fasboot boot command and it just restarts normally and for some reason, doing volume down and power doesn't enter the recovery either.
Click to expand...
Click to collapse
I'm not sure you can reboot to recovery from fastboot.
Some people tell you can launch "fastboot reboot recovery" but it is not a standard command and does not work for me.
In fastboot you can boot the recovery image file with
Code:
fastboot boot recovery.img
Change recovery.img with your recovery file.
Keeping it simply, can you reboot normally and reboot to recovery via adb? With "adb reboot recovery"

Fastboot is the way to flash anything
Your phone don't have to get recognized by adb, it's more for sideload or apk installation. To flash recovery, you need fastboot.
Try fastboot flash recovery recovery.img (recovery.img should be in the same folder as fastboot.exe)

Is there any news? I have a similar problem:
I boot in fastboot mode and I run `fastboot oem device-info` to check status:
Code:
$ fastboot oem device-info [15:20:59]
(bootloader) Verity mode: true
(bootloader) Device unlocked: true
(bootloader) Device critical unlocked: true
(bootloader) Charger screen enabled: false
OKAY [ 0.001s]
Finished. Total time: 0.001s
And it seems ok.
Now I try
Code:
$ fastboot flash recovery recovery.img
and it stuck there and it don't do anything.
I tried different PCs and different cables, nothing make it works!
Normally it only lasts some seconds...
What should I try?
Thanks in advance