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[Root] [guide] Samsung Galaxy A20 rooting guide (Android 9 & 10)

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By physwizz, Senior Member on 5th August 2019, 10:35 PM
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Read the first 3 posts before you proceed.
For Android 10 go here
https://forum.xda-developers.com/gal...e-a20-t4095589

WARNING: Rooting your phone may be dangerous.
Rooting a device may void the warranty on the device. It may also make the device unstable or if not done properly, may completely brick the device. XDA-Developers or the author does not take any responsibility for your device. Root at your own risk and only if you understand what you are doing!
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5th August 2019, 10:36 PM |#2  
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Advantages of rooting:

Once you root your device you can install flashable zip files and custom ROMs.

You can backup all your apps and data using Titanium Backup.

You can customize your device according to your needs by deleting unwanted system apps and using Deathly Adiutor to modify the kernel.
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Disadvantages of Rooting:

Once you root your device, your device warranty will be void.

After rooting yourndevice may become unstable.

You may not be able to upgrade OTA in the future.
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5th August 2019, 10:37 PM |#3  
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This method should root your Samsung Galaxy SM-A205X (all models except SM-A205U and SM-A205DL).
It was developed for the U2 bootloader (June 2019 firmware)

This method does not work for the a20s (A207X)

This method can be used to root other Samsung phones including the a20e( post#77 post#180, post#256)


Quick Root and TWRP for A205xx
https://forum.xda-developers.com/gal...y-a20-t4069423
You'll find it much quicker.

Repair Firmware
This site contains
1. Full repair firmware
2. Combination firmware
3. Fix dm verify
4. Root instructions and unpatched boot images
https://www.full-repair-firmware.com/search?q=A20

More firmware (some are even prerooted)
https://www.needromarab.com/1/122/SAMSUNG

Samfirm Tool for really fast downloads
https://samfirmtool.com/samfirm-v0-5-0
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5th August 2019, 10:39 PM |#4  
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Useful videos
https://youtu.be/vcZEgto8-wc
https://www.youtube.com/watch?v=Vuhwt2tEGl8

Instructions

A. Prepare boot image

1. Download magisk manager apk
2. Download the exact firmware (including upgrade date) for your device from https://samfrew.com or https://www.samfirmware.net/ or https://www.full-repair-firmware.com/search?q=A20 or
https://samfw.com/
3. Use zarchiver to copy AP_20xxxxxxxx.md5 to download directory. It will extract it from the zip.
4. Rename AP_20xxxxxxxx.md5 to AP_20xxxxxxx.tar and extract using zarchiver
5. Copy boot.img.Iz4 to download directory and extract (resulting in boot.img)
6. Use magisk manager to patch boot.img (use top install) result magisk_patched.img
(If using Magisk (Canary) patch, options should be remove dm-verity and not via recovery, but allowing Persist Encrypt.)
7. Rename magisk_patched.img to boot.img
9. Use zarchiver to compress boot.img to boot.tar. If you have a A205xx June firmware (U2 bootloader), you can use my one of you're willing to take a risk. boot.zip. Just unzip it first.
9a. For a20e users, try this boot.img https://forum.xda-developers.com/sho...&postcount=260
10. Copy boot.tar to Windows pc or Windows Virtualbox.
11. On phone developer options in settings unlock OEM and enable usb debugging


(If using Linux
9. Don't compress `boot.img`
10. install heimdall flash with `sudo apt install heimdall-flash`, if you want front-end install it with `sudo apt install heimdall-flash-frontend`)


B. Unlock bootloader

Useful video https://www.youtube.com/watch?v=pgDS9K7JCrk

12. Backup data. It will be wiped.
13. Turn phone off
14. Hold vol- and vol+ and plug in power cable attached to pc then release vol up to enter unlock screen.
15. Follow the instructions to unlock
(You might need to long press vol up to unlock bootloader)
vol + to select yes to confirm.
17. Press power key to unlock bootloader.
18. Reboot and reactivate developer options and enable usb debugging. Don't enter too much data at this stage as you will lose it again later.

C. Flash boot image.

19. Turn phone on in bootloader (download) mode (Hold power and vol+ to enter recovery mode then select bootloader download mode)
20. Connect phone to computer.
21. Use Odin in Windows to add boot.tar to phone. (Select AP). Some people recommend adding the other firmware parts to their slots at the same time.
22. Restart phone
23. select bootloader
24. Select factory reset (this will wipe data)
25. Restart phone
26. install data
26. install magisk manager
27. If green phone is rooted.
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28. Of red select install/direct install
29. Advanced tick both.
30. Install root checker and verify root

If Something Goes Wrong
Go here

https://forum.xda-developers.com/gal...overy-t4068369

If you get a DTBO error after updating Magisk, flash this vbmeta https://drive.google.com/file/d/1-do...iq90SDlmc/view

(If using Linux
To flash:
20. Detect device with `heimdall detect`
21. Flash the `boot.img` with `heimdall flash --BOOT {location of the boot.img, you can also just drop the file into terminal and terminal should auto-fill it}` ex: `heimdall flash --BOOT '/home/utku/Programlar/ext/boot.img'`

P.S: an easy way to boot into download mode is `adb reboot bootloader`)



If you want to remove the warning messages on the boot screen
try this.
https://forum.xda-developers.com/gal...ocked-t3954589
The images shown on the A30 thread aren't suitable for the A20 so I have included some better ones here.

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You can use this param.tar to make these changes easier.
https://forum.xda-developers.com/sho...2&postcount=91

You can now move on to install TWRP
This TWRP was originally designed for Android 9 but works perfectly with Android 10 and also has MTP built-in.
https://forum.xda-developers.com/gal...xynos-t4013481
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6th August 2019, 02:58 AM |#6  
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On the lighter side of rooting....
From the A30 forum:
https://forum.xda-developers.com/gal...ocked-t3954589
Works for A20 too
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6th August 2019, 03:24 AM |#7  
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Quote:
Originally Posted by jajk

On the lighter side of rooting....
From the A30 forum:
https://forum.xda-developers.com/gal...ocked-t3954589
Works for A20 too

Another reason to merge. This is a procedure for removing those annoying error messages on startup screens.
7th August 2019, 08:45 AM |#8  
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A205U owners complaining about not being able to oem unlock bootloader might want to study this:
https://forum.xda-developers.com/and...-13-1-t3762572
It looks like a way to switch to another unlockable firmware version.
7th August 2019, 09:39 AM |#9  
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Please, need magisk_patched.img file for SM-A205F.
7th August 2019, 01:47 PM |#10  
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Quote:
Originally Posted by jajk

A205U owners complaining about not being able to oem unlock bootloader might want to study this:
https://forum.xda-developers.com/and...-13-1-t3762572
It looks like a way to switch to another unlockable firmware version.

Yeah tried that option. Samsung has our model on a bootloader 2, means our device won't accept flashing from any other firmware but the original non-modded firmware only.
Tried prince Odin,patched Odin all versions, tried Heimdall etc..
Error is ...boot secure check failed..
I've tried to flash firmware a205G only with fail error Everytime.

Psa I've had my a205u for 10 days no OEM unlock option.

Main reason why I'm not buying another Samsung phone.
Bought a Moto g7 and the g7 power ..I rooted both within 10 min from purchase. Motorola emailed me my bootloader unlock code . Fastboot flashed and Bam good to go. I'm done .
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7th August 2019, 06:36 PM |#11  
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Quote:
Originally Posted by jhjhjhjhjhjh

Bought a Moto g7 and the g7 power ..I rooted both within 10 min from purchase. Motorola emailed me my bootloader unlock code . Fastboot flashed and Bam good to go. I'm done .

^^^^^^^^^^^^^^^^^^^^^^^THIS ALL DAY. I swapped mine out for the G7 Power and already done rooted, flashed, and wrote a guide while all the 205u users are waiting for the mythical OEM Unlock to magically appear which it ain't gonna. Sammy can kiss my techie ass...we are officially divorced. I won't even go back and buy an old Sammy like I wanted to (was thinking about getting that S7 edge). It's me and Moto for now.
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