Fastboot Boot Recovery.IMG not Working after Update

[ReproOne]

I have been using "fastboot boot recovery.img" to load into TWRP after OTA updates to load SuperSU as I am only rooted using the stock ROM. However, after this recent update (2.16.651.4) that includes the WiFi Calling and Android 4.4.3, when I run the command it just causes the phone to reboot. It does not reboot into TWRP, which is my recovery.img file.

I found a Nexus thread talking about having to add a kernel command line for the Nexus after a certain version of hboot, so I am not sure if it is related.

Does anyone know how to fastboot boot now with the latest update? I would like to avoid replacing my stock recovery with TWRP and just continue to boot into it. Alternatively, is there any other way to install supersu?

Thank you,

Ben

 

[nfinitefx45]

I have been using "fastboot boot recovery.img" to load into TWRP after OTA updates to load SuperSU as I am only rooted using the stock ROM. However, after this recent update (2.16.651.4) that includes the WiFi Calling and Android 4.4.3, when I run the command it just causes the phone to reboot. It does not reboot into TWRP, which is my recovery.img file.

I found a Nexus thread talking about having to add a kernel command line for the Nexus after a certain version of hboot, so I am not sure if it is related.

Does anyone know how to fastboot boot now with the latest update? I would like to avoid replacing my stock recovery with TWRP and just continue to boot into it. Alternatively, is there any other way to install supersu?

Thank you,

Ben

As a quick work around flash twrp onto the device, once done with it then flash the factory recovery back, Also check to make sure your bootloader didn't relock after update.

stock recovery from the update.

 

[ReproOne]

As a quick work around flash twrp onto the device, once done with it then flash the factory recovery back, Also check to make sure your bootloader didn't relock after update.

stock recovery from the update.

Thank you for the reply. I thought about taking that approach, but I was really hoping someone would have an answer on why the procedure wasn't working now. My bootloader is still unlocked.

I found this as an approach someone did on the Nexus 4 for a similar issue:

fastboot -c "lge.kcal=0|0|0|x" boot customrecovery.img

Thoughts?

 

[ReproOne]

nfinitefx45:

I did just now flash TWRP into recovery, loaded SuperSU, and then flashed your recovery.img back to the phone. So thank you very much for the recovery.img.

I'd still like to know if fastboot boot can still work, and also if there is a way in the future I can get my own recovery.img (possibly back it up before taking an OTA)?

 

[nfinitefx45]

nfinitefx45:

I did just now flash TWRP into recovery, loaded SuperSU, and then flashed your recovery.img back to the phone. So thank you very much for the recovery.img.

I'd still like to know if fastboot boot can still work, and also if there is a way in the future I can get my own recovery.img (possibly back it up before taking an OTA)?

not sure about the fastboot issue, but to backup your recovery any time just go to adb and type the following
adb shell
su
dd if=/dev/block/mmcblk0p43 of=/sdcard2/recovery.img


this will copy your recovery to the external sdcard

 

[ReproOne]

Thank you for those steps. I do not have an external SD card installed, so I modified it to store the recovery.img on sdcard instead.

Now I can always fastboot flash twrp and then back to stock recovery.

Thank you again!

 

[an0ther]

not sure about the fastboot issue, but to backup your recovery any time just go to adb and type the following
adb shell
su
dd if=/dev/block/mmcblk0p43 of=/sdcard2/recovery.img


this will copy your recovery to the external sdcard

You would need root to do this. Not being able to use "fastboot boot" you would just be backing up the flashed recovery. Possibly towel root temp root, but I would assume it has been patched in newest update.

 

[neudof]

So I am S-On with a non-HK M8
I was on stock rooted 4.4.2 and I flashed the stock recovery and took the OTA
Now I am on 4.4.3 and still have SuperSU installed (not rooted)
Everything is working fine, but when I try to boot to recovery i get the red triangle with the !

Any suggestions?

 

[xPhantom]

So I am S-On with a non-HK M8
I was on stock rooted 4.4.2 and I flashed the stock recovery and took the OTA
Now I am on 4.4.3 and still have SuperSU installed (not rooted)
Everything is working fine, but when I try to boot to recovery i get the red triangle with the !

Any suggestions?

That's the stock recovery. Did you ever flash a custom recovery back on after the OTA?

 

[neudof]

That's the stock recovery. Did you ever flash a custom recovery back on after the OTA?

I am s-on & unlocked but i was able to flash the stock recovery from sd card to take the ota.

Is it possible to flash twrp back in the same way?

 

[xPhantom]

I am s-on & unlocked but i was able to flash the stock recovery from sd card to take the ota.

Is it possible to flash twrp back in the same way?

Yes, after the OTA, just flash TWRP back through fastboot and then re-flash SuperSU to get root back.

 

[ReproOne]

As a quick work around flash twrp onto the device, once done with it then flash the factory recovery back, Also check to make sure your bootloader didn't relock after update.

stock recovery from the update.

I just applied the update released today, and I tried to save the recovery.img file before flashing TWRP. However, it kept giving me permission denied. Do you have the recovery.img file from the update released today so I can use it for the next update?

 

[nnamathy]

fastboot not working

please any help on how to access fastboot on HTC one m8.
its showing black screen n fastboot mode...
wot can I do 2 annul d problem

 

[jinal shah]

rooting problem

hey i am using htc one m8, i unlocked the bootloader and the device reads as
device status modified
*unlocked*
s-on
after this i flashed twrp and cwm a couple of times but its not loading on the device but shows success in the command window, however after clicking on recovery the custom recovery does not show up, and it reboots back into the fastboot mode.
please help me
thank you

 

[Magnum_Enforcer]

hey i am using htc one m8, i unlocked the bootloader and the device reads as
device status modified
*unlocked*
s-on
after this i flashed twrp and cwm a couple of times but its not loading on the device but shows success in the command window, however after clicking on recovery the custom recovery does not show up, and it reboots back into the fastboot mode.
please help me
thank you

What's the output in the terminal when you fastboot flash recovery?

 

[jinal shah]

rooting problem

It doesn't show any error as such.
In the command window it shows successful.
But when I click on recovery it reboots back to fast boot.
Like for a second it shows the screen which reads 'this build is only for developers'
But then instead of opening Twrp it reboots back to fast boot.