How to root Unisoc | Spreadtrum Android 9+; Case study: Teclast P80X
How to root Unisoc | Spreadtrum Android 9+; Case study: Teclast P80X
09-12-2020, 11:39 AM
(05-12-2020, 12:53 PM)hovatek ...
As explained in the guide, if you want to root via recovery then you need to go though the research download tool trick to get the tablet to power off. Only then can you attempt booting into recovery mode using button combo.
Mind you, the phone will just boot up when you try entering recovery mode from off state but you'll have root.
Hi, how to go through the research download tool trick to get the tablet to Power Off? I saw somewhere on Hovateck forum but can't find it now. There was even a link to YT...
10-12-2020, 08:46 AM
(09-12-2020, 11:39 AM)_Jaqb_ Hi, how to go through the research download tool trick to get the tablet to Power Off? I saw somewhere on Hovateck forum but can't find it now. There was even a link to YT...
Here https://www.hovatek.com/forum/thread-32663.html
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10-12-2020, 11:37 AM
(10-12-2020, 08:46 AM)hovatek(09-12-2020, 11:39 AM)_Jaqb_ Hi, how to go through the research download tool trick to get the tablet to Power Off? I saw somewhere on Hovateck forum but can't find it now. There was even a link to YT...
Here https://www.hovatek.com/forum/thread-32663.html
Thank you very much!
I used flashing via fastboot for 2 files: recovery_patched_mysign.img and vbmeta_my_sign.img to root my device.
After:
Do I choose only the stock pac file in Research Download tool?
Do I have to replace the stock files with my own somehow?
to go through the research download tool trick to get the tablet to Power Off and on in recovery mode?
This post was last modified: 10-12-2020, 11:39 AM by _Jaqb_.
11-12-2020, 04:06 AM
(10-12-2020, 11:37 AM)_Jaqb_ Thank you very much!
I used flashing via fastboot for 2 files: recovery_patched_mysign.img and vbmeta_my_sign.img to root my device.
After:
Do I choose only the stock pac file in Research Download tool?
Do I have to replace the stock files with my own somehow?
to go through the research download tool trick to get the tablet to Power Off and on in recovery mode?
The trick behind the research download thing is that you choose your device's pac file but flash nothing. Instead, you just backup any small partition.
What you're after is Research Download tool's 'power off after operation' feature. You just carry out an operation to initiate this feature
This post was last modified: 11-12-2020, 04:08 AM by hovatek.
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11-12-2020, 10:01 AM
(11-12-2020, 04:06 AM)hovatek(10-12-2020, 11:37 AM)_Jaqb_ Thank you very much!
I used flashing via fastboot for 2 files: recovery_patched_mysign.img and vbmeta_my_sign.img to root my device.
After:
Do I choose only the stock pac file in Research Download tool?
Do I have to replace the stock files with my own somehow?
to go through the research download tool trick to get the tablet to Power Off and on in recovery mode?
The trick behind the research download thing is that you choose your device's pac file but flash nothing. Instead, you just backup any small partition.
What you're after is Research Download tool's 'power off after operation' feature. You just carry out an operation to initiate this feature
Thx! I flashed 2 files. Later, I 'power off my Teclast P80X in Research Download tool . It still starts up normally (no root), I can't rename recovery-from-boot.p. Booting to recovery mode doesn't work via Power and Vol- button....
P.S.
I do not fully understand what the Research Download tool is for yet... For example: how to upload single img with this tool?
This post was last modified: 11-12-2020, 12:04 PM by _Jaqb_.
12-12-2020, 04:41 AM
(11-12-2020, 10:01 AM)_Jaqb_ Thx! I flashed 2 files. Later, I 'power off my Teclast P80X in Research Download tool . It still starts up normally (no root), I can't rename recovery-from-boot.p. Booting to recovery mode doesn't work via Power and Vol- button....
P.S.
I do not fully understand what the Research Download tool is for yet... For example: how to upload single img with this tool?
You can ask this in your thread so I explain. Don't want to derail this thread
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27-04-2021, 07:49 PM
I have a P80X G5K4 EEA, which came with v1.02 ROM, but screen blinked, so i had to flash the only ROM available: v1.00. I don't know if this is relevant to the rest of my post (or is there any other newer ROM available for this model - or compatible with this model).
I have bricked the tablet, and recovered thanks to your tips. Now it's fully functional, but it's unrooted, and i have to work to get the very first step done: unlock bootloader (now it's unlocked). I don't really want to think how hard the manufacturers are getting this kind of simple things (at least, they were simple things).
I want to ask 2 3 things:
- Is the magisk patched boot.img method worse in any sense? It seems simpler to me, and i believe you won't lose the root by rebooting. Please tell me if i'm wrong.
- You have mentioned a signed vbmeta is also a requierement. Is this correct? Now i know it *IS* needed.
- Do you need to sign patched boot.img? One user told so, and some other have suggested it.
- Do you need to sign boot partition? That user told also about this, and i can't understand it... You can sign a file, but how do you sign a partition???
This post was last modified: 28-04-2021, 03:37 AM by JoseCSS.
28-04-2021, 11:10 AM
(27-04-2021, 07:49 PM)JoseCSS ...
- Is the magisk patched boot.img method worse in any sense? It seems simpler to me, and i believe you won't lose the root by rebooting. Please tell me if i'm wrong.
you'll only loose root if you flash back stock boot.img
(27-04-2021, 07:49 PM)JoseCSS - Do you need to sign patched boot.img? One user told so, and some other have suggested it.
you need to sign the patched boot.img using avbtool
(27-04-2021, 07:49 PM)JoseCSS - Do you need to sign boot partition? That user told also about this, and i can't understand it... You can sign a file, but how do you sign a partition???
No, you can't sign the partition itself
i'm guessing the user meant you should sign the file
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28-04-2021, 02:55 PM
(28-04-2021, 11:10 AM)X3nonThanks for your tips again(27-04-2021, 07:49 PM)JoseCSS ...
- Is the magisk patched boot.img method worse in any sense? It seems simpler to me, and i believe you won't lose the root by rebooting. Please tell me if i'm wrong.
you'll only loose root if you flash back stock boot.img
(27-04-2021, 07:49 PM)JoseCSS - Do you need to sign patched boot.img? One user told so, and some other have suggested it.
you need to sign the patched boot.img using avbtool
(27-04-2021, 07:49 PM)JoseCSS - Do you need to sign boot partition? That user told also about this, and i can't understand it... You can sign a file, but how do you sign a partition???
No, you can't sign the partition itself
i'm guessing the user meant you should sign the file
I made a mistake again (d'oh!)
I modified the huge command to sign vbmeta with all the public keys and obtain vbmeta-sign-custom.img, to have my own public key for the boot and recovery partitions. I didn't modify patched_boot.img, i really thought that Magisk would sign it, and didn't fully understand that "patched" does not mean "signed by your own key".
I flashed vbmeta without problems, but flashing patched_boot.img didn't finish, it just get stuck. Now i know that a signed+patched boot.img would have succeed. Anyway, my tablet boots to Android without problems.
But i think that making a custom boot+recovery-signed vbmeta was a mistake cause even i didn't want to flash a custom recovery, now i can't enter fastboot mode, and also i can't enter recovery mode to reboot to bootloader. Now i think i only needed to generate a boot-only signed vbmeta (i mean, not signing recovery with my own public key). Is this asumption correct?
I thought that signing process was only relevant in the momento of flashing, but now i believe that when i try to enter recovery mode, the key used in vbmeta for recovery (custom) and the key used in recovery.img (stock, not flashed by me) don't match, so recovery mode is broken, hence fastboot mode is also broken.
If i could flash a new boot-only signed vbmeta it would be fixed, if i could flash a signed recovery.img it would also be fixed, but... now i can't flash anything.
Some more questions:
- Is there a way to enter fastboot?
- Do i need to flash stock ROM through SPD Upgrade Tool and begin from scratch?
- If the prior question is true... How can i do it? I read in the first post this statement: "If you must flash back your stock rom, ensure to flash back your stock vbmeta-sign.img first" How can i flash stock vbmeta-sign.img if i can't enter fastboot?
A lot of thanks in advance for your help!
This post was last modified: 28-04-2021, 02:56 PM by JoseCSS.
28-04-2021, 03:09 PM
(28-04-2021, 02:55 PM)JoseCSS But i think that making a custom boot+recovery-signed vbmeta was a mistake cause even i didn't want to flash a custom recovery, now i can't enter fastboot mode, and also i can't enter recovery mode to reboot to bootloader. Now i think i only needed to generate a boot-only signed vbmeta (i mean, not signing recovery with my own public key). Is this asumption correct?
Yes, it is. You only add a custom key for the partition you intend to modify when building vbmeta.
(28-04-2021, 02:55 PM)JoseCSS Some more questions:
- Is there a way to enter fastboot?
- Do i need to flash stock ROM through SPD Upgrade Tool and begin from scratch?
- If the prior question is true... How can i do it? I read in the first post this statement: "If you must flash back your stock rom, ensure to flash back your stock vbmeta-sign.img first" How can i flash stock vbmeta-sign.img if i can't enter fastboot?
You're to flash back the stock vbmeta first then stock boot and recovery. All these using Research Download tool as explained @ https://www.hovatek.com/forum/thread-28774.html
While you could attempt flashing your signed-boot-only vbmeta using Research download tool, any signature error you get (if you do) could cause the tablet to get stuck in flash mode. That is something you don't want to happen
This post was last modified: 28-04-2021, 03:15 PM by hovatek.
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