[Tutorial] How to create a custom signed vbmeta.img for Unisoc using AVBtool
[Tutorial] How to create a custom signed vbmeta.img for Unisoc using AVBtool
25-07-2024, 09:32 AM
(24-07-2024, 08:33 PM)Aptiva Is it possible to pull the existing signature from a device?
Very unlikely
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10-08-2024, 12:55 AM
(14-08-2020, 10:33 PM)Ejike Dex(14-08-2020, 07:21 PM)hovatek(14-08-2020, 04:47 PM)Ejike Dex Hey guys thanks for this amazing site and all the informative resources. I followed your guide and was able to generate a signed vbmeta image .
My question now is, when flashing it via fastboot? is the command below correct or am I mistaking something?
Code:fastboot flash boot vbmeta_custom.img
Your command would flash vbmeta to boot partition.
It should be
Code:fastboot flash vbmeta vbmeta_custom.img
Thank you very much. I am guessing after this I just have to flash a patched recovery image to the boot partition right? Flashing an Itel S15 running android 9 pie
I'm using the same device as yours. The instructions to port a working twrp recovery is convoluted. Please could you share or upload your ported TWRP so I could flash it to my phone. Thanks in anticipation.
27-08-2024, 09:30 AM
(14-08-2020, 10:33 PM)Ejike Dex(14-08-2020, 07:21 PM)hovatek(14-08-2020, 04:47 PM)Ejike Dex Hey guys thanks for this amazing site and all the informative resources. I followed your guide and was able to generate a signed vbmeta image .
My question now is, when flashing it via fastboot? is the command below correct or am I mistaking something?
Code:fastboot flash boot vbmeta_custom.img
Your command would flash vbmeta to boot partition.
It should be
Code:fastboot flash vbmeta vbmeta_custom.img
Thank you very much. I am guessing after this I just have to flash a patched recovery image to the boot partition right? Flashing an Itel S15 running android 9 pie
Sir please provide me the details of how u unlocked the itel s15 bootloader please
27-08-2024, 09:31 AM
(14-08-2020, 10:33 PM)Ejike Dex(14-08-2020, 07:21 PM)hovatek(14-08-2020, 04:47 PM)Ejike Dex Hey guys thanks for this amazing site and all the informative resources. I followed your guide and was able to generate a signed vbmeta image .
My question now is, when flashing it via fastboot? is the command below correct or am I mistaking something?
Code:fastboot flash boot vbmeta_custom.img
Your command would flash vbmeta to boot partition.
It should be
Code:fastboot flash vbmeta vbmeta_custom.img
Thank you very much. I am guessing after this I just have to flash a patched recovery image to the boot partition right? Flashing an Itel S15 running android 9 pie
Sir please provide me the details of how u unlocked the itel s15 bootloader please
01-09-2024, 02:19 PM
(27-08-2024, 09:31 AM)Yashraj Sir please provide me the details of how u unlocked the itel s15 bootloader please
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22-02-2025, 01:33 AM
This post was last modified: 22-02-2025, 01:35 AM by HeroEpic123.
22-02-2025, 04:46 PM
(22-02-2025, 01:33 AM)HeroEpic123 My device doesn't have the recovery partition, so should I ignore the hovatek.bin?
NO. Do this instead:
1. Remove the 'recovery' entry entirely from your avbtool command.
2. Check your stock vbmeta using:
python avbtool info_image --image vbmeta-sign.img
Ensure "recovery" isn't listed under "Descriptors".
3. If you're modifying OTHER partitions (e.g., boot), replace THEIR public keys with hovatek.bin in the avbtool command.
4. Keep hovatek.bin in the "keys" folder but only use it for partitions you're modifying.
07-08-2025, 04:21 PM
thank you for the tutorial. It works for newbies like me. I have a Blackwiew Tab 16 with SoC: Unisoc Tiger T616 running on Android 12. I followed every step of the tutorial and it works well. For the DHTP I took the vbmeta_pad.py for Android 9, because the Hex is 00 40 00 00. As I compared the files, the DHTP was different, so I copied the DHTP data from the original to the custom vbmeta.
For the key I used the rsa4096_vbmeta.pem.
As I try to flash it with fastboot it won`t work and there was a fault. Should I flash it per EDL Recovery tool?
I´ve attached the original vbmeta and the one I created. My goal is to root the tablet with Magisk and create a TWRP (with your online tool :-)) and flash it.
Thank you in advance for your help!
Attached Files
07-08-2025, 09:45 PM
(07-08-2025, 04:21 PM)chklotzba Hello,
thank you for the tutorial. It works for newbies like me. I have a Blackwiew Tab 16 with SoC: Unisoc Tiger T616 running on Android 12. I followed every step of the tutorial and it works well. For the DHTP I took the vbmeta_pad.py for Android 9, because the Hex is 00 40 00 00. As I compared the files, the DHTP was different, so I copied the DHTP data from the original to the custom vbmeta.
For the key I used the rsa4096_vbmeta.pem.
As I try to flash it with fastboot it won`t work and there was a fault. Should I flash it per EDL Recovery tool?
I´ve attached the original vbmeta and the one I created. My goal is to root the tablet with Magisk and create a TWRP (with your online tool :-)) and flash it.
Thank you in advance for your help!
The error will be here if you have not signed both files "boot.img and vendor_boot.img" with the key rsa4096_vbmeta.pem
Code:
Chain Partition descriptor:
Partition Name: boot
Rollback Index Location: 1
Public key (sha1): 2597c218aae470a130f61162feaae70afd97f011
Flags: 0
Chain Partition descriptor:
Partition Name: vendor_boot
Rollback Index Location: 14
Public key (sha1): 2597c218aae470a130f61162feaae70afd97f011
Flags: 0
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