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Crash Recovery for the Samsung Galaxy A20

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physwizz

Senior Member
Sep 16, 2013
3,160
686
Sydney
Crash Recovery for the Samsung Galaxy A20

1. Be Prepared

Most of us will suffer from a crash at some time. If you know how to fix it, you will have a lot less stress.
There are certain files you need to keep in readiness.

Always backup boot, data, system before you try any new ROM.
A. On your PC
- Firmware you downloaded from one of these sites
https://samfrew.com or https://www.samfirmware.net
or for a faster download: https://forum.xda-developers.com/galaxy-a20/how-to/a20-repair-firmware-t4066551
- recovery.tar you can download from here https://forum.xda-developers.com/galaxy-a20/how-to/guide-quick-root-twrp-galaxy-a20-t4069423
B. On your A20 external sd
Don't keep any important files on your internal sd card. Keep backups on the external sd and on usb otg.

- Boot, data, system backup
- Disable_Dm-Verity_ForceEncrypt_08.18.2019.zip
or this one
View attachment 4975463


To go to download mode

Normal method
1. Turn off phone
2. Hold down both volume keys
3. Plug in computer

Bootlooping
1. Plug in to computer
2. Hold down both volume keys

For a difficult phone
1. Connect usb to computer but not to phone
2. Hold down all 3 keys
3. When it buzzes release power and quickly plug in usb to phone.
It might take a few times to get it right.

If it's REALLY BAD
1. Wait for the battery to completely run down and use normal method.



2. Soft Crash
This is when you get a bootloop.

Recover method
1. Reboot into TWRP( hold down all 3 keys and release vol down when it reboots)
2. Restore your backup.

3. Hard Crash
This is when you get red text along the top.

Recover method
1. Connect phone cord to PC
2. Reboot into download mode (Hold down all 3 keys
When the phone reboot release power key and plug in to computer at the same time
It may take a few times to get the timing right)
3. Flash each part of the firmware into its slot.
BL_20xxxxxxx.tar.md5 goes into the BL slot
AP_20xxxxxxx.tar.md5 goes into the AP slot
CP_20xxxxxxx.tar.md5 goes into the CP slot
HOME_CSC_xxxxxx.tar.md5 goes into the CSC slot
4. You might do a Factory data reset
5. Wait for the restart
6. Skip through a minimal setup
7. Activate developer mode
8. Allow usb debugging
9. Reboot into download mode
10. Flash recovery.tar in the AP slot
11. Reboot the A20 into TWRP and mount everything that you can.
12. Format Data (not just wipe) - don't restart
13. Flash Disable_Dm-Verity_ForceEncrypt
14. Wipe both caches then go back and Reboot into Recovery.
15. Restore your data backup.
16. Reboot

 
Last edited:

Dan225

Member
Dec 22, 2013
41
3
8. Reboot the A20 into TWRP and mount everything that you can.
9. Format Data (not just wipe)
10. Flash Disable_Dm-Verity_ForceEncrypt_08.18.2019.zip
11. Reboot into Recovery.
Please how to boot manually to download mode? I have installed Carlos Kernel and my phone has black screen after Samsung boot logo.
 

physwizz

Senior Member
Sep 16, 2013
3,160
686
Sydney
Please how to boot manually to download mode? I have installed Carlos Kernel and my phone has black screen after Samsung boot logo.

turn phone off
connect to computer and hold down both volume keys

but for twrp mode
hold all 3 buttons until the phone reboots and release volume down
 
Last edited:
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Astreinz

Member
Jan 24, 2021
16
2
Samsung Galaxy A20
Crash Recovery for the Samsung Galaxy A20

1. Be Prepared

Most of us will suffer from a crash at some time. If you know how to fix it, you will have a lot less stress.
There are certain files you need to keep in readiness.

Always backup boot, data, system before you try any new ROM.
A. On your PC
- Firmware you downloaded from one of these sites
https://samfrew.com or https://www.samfirmware.net
or for a faster download: https://forum.xda-developers.com/galaxy-a20/how-to/a20-repair-firmware-t4066551
- recovery.tar you can download from here https://forum.xda-developers.com/galaxy-a20/how-to/guide-quick-root-twrp-galaxy-a20-t4069423
B. On your A20 external sd
Don't keep any important files on your internal sd card. Keep backups on the external sd and on usb otg.

- Boot, data, system backup
- Disable_Dm-Verity_ForceEncrypt_08.18.2019.zip
or this one
View attachment 4975463


To go to download mode

Normal method
1. Turn off phone
2. Hold down both volume keys
3. Plug in computer

Bootlooping
1. Plug in to computer
2. Hold down both volume keys

For a difficult phone
1. Connect usb to computer but not to phone
2. Hold down all 3 keys
3. When it buzzes release power and quickly plug in usb to phone.
It might take a few times to get it right.

If it's REALLY BAD
1. Wait for the battery to completely run down and use normal method.



2. Soft Crash
This is when you get a bootloop.

Recover method
1. Reboot into TWRP( hold down all 3 keys and release vol down when it reboots)
2. Restore your backup.

3. Hard Crash
This is when you get red text along the top.

Recover method
1. Connect phone cord to PC
2. Reboot into download mode (Hold down all 3 keys
When the phone reboot release power key and plug in to computer at the same time
It may take a few times to get the timing right)
3. Flash each part of the firmware into its slot.
BL_20xxxxxxx.tar.md5 goes into the BL slot
AP_20xxxxxxx.tar.md5 goes into the AP slot
CP_20xxxxxxx.tar.md5 goes into the CP slot
HOME_CSC_xxxxxx.tar.md5 goes into the CSC slot
4. You might do a Factory data reset
5. Wait for the restart
6. Skip through a minimal setup
7. Activate developer mode
8. Allow usb debugging
9. Reboot into download mode
10. Flash recovery.tar in the AP slot
11. Reboot the A20 into TWRP and mount everything that you can.
12. Format Data (not just wipe) - don't restart
13. Flash Disable_Dm-Verity_ForceEncrypt
14. Wipe both caches then go back and Reboot into Recovery.
15. Restore your data backup.
16. Reboot

hello sir, i need help.
after rooting my phone succesfully and try to using eureka kernel my phone just get bootloop. before that, i dont know why i cannot backup data, system and etc you just write on guide. then i enter download mode and inadvertenly pressing "dont unlock bootloader". now my phone just stay in download mode with text writed on it in red colour "vbmeta: error verifying vbmeta image..."

if it can be fixed please tell me how to fix that. Thank you very much @
 

physwizz

Senior Member
Sep 16, 2013
3,160
686
Sydney
hello sir, i need help.
after rooting my phone succesfully and try to using eureka kernel my phone just get bootloop. before that, i dont know why i cannot backup data, system and etc you just write on guide. then i enter download mode and inadvertenly pressing "dont unlock bootloader". now my phone just stay in download mode with text writed on it in red colour "vbmeta: error verifying vbmeta image..."

if it can be fixed please tell me how to fix that. Thank you very much @
Try again.
This time use a long press to unlock
 

louiskaneko

New member
Apr 29, 2021
1
0
cant even boot into download mode or twrp i actually have a scv46 that is actually samsung a20 rip my phone
 

physwizz

Senior Member
Sep 16, 2013
3,160
686
Sydney
cant even boot into download mode or twrp i actually have a scv46 that is actually samsung a20 rip my phone
For a difficult phone
1. Connect usb to computer but not to phone
2. Hold down all 3 keys
3. When it buzzes release power and quickly plug in usb to phone.
It might take a few times to get it right.

If it's REALLY BAD
1. Wait for the battery to completely run down and use normal method.
 

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  • 6
    Crash Recovery for the Samsung Galaxy A20

    1. Be Prepared

    Most of us will suffer from a crash at some time. If you know how to fix it, you will have a lot less stress.
    There are certain files you need to keep in readiness.

    Always backup boot, data, system before you try any new ROM.
    A. On your PC
    - Firmware you downloaded from one of these sites
    https://samfrew.com or https://www.samfirmware.net
    or for a faster download: https://forum.xda-developers.com/galaxy-a20/how-to/a20-repair-firmware-t4066551
    - recovery.tar you can download from here https://forum.xda-developers.com/galaxy-a20/how-to/guide-quick-root-twrp-galaxy-a20-t4069423
    B. On your A20 external sd
    Don't keep any important files on your internal sd card. Keep backups on the external sd and on usb otg.

    - Boot, data, system backup
    - Disable_Dm-Verity_ForceEncrypt_08.18.2019.zip
    or this one
    View attachment 4975463


    To go to download mode

    Normal method
    1. Turn off phone
    2. Hold down both volume keys
    3. Plug in computer

    Bootlooping
    1. Plug in to computer
    2. Hold down both volume keys

    For a difficult phone
    1. Connect usb to computer but not to phone
    2. Hold down all 3 keys
    3. When it buzzes release power and quickly plug in usb to phone.
    It might take a few times to get it right.

    If it's REALLY BAD
    1. Wait for the battery to completely run down and use normal method.



    2. Soft Crash
    This is when you get a bootloop.

    Recover method
    1. Reboot into TWRP( hold down all 3 keys and release vol down when it reboots)
    2. Restore your backup.

    3. Hard Crash
    This is when you get red text along the top.

    Recover method
    1. Connect phone cord to PC
    2. Reboot into download mode (Hold down all 3 keys
    When the phone reboot release power key and plug in to computer at the same time
    It may take a few times to get the timing right)
    3. Flash each part of the firmware into its slot.
    BL_20xxxxxxx.tar.md5 goes into the BL slot
    AP_20xxxxxxx.tar.md5 goes into the AP slot
    CP_20xxxxxxx.tar.md5 goes into the CP slot
    HOME_CSC_xxxxxx.tar.md5 goes into the CSC slot
    4. You might do a Factory data reset
    5. Wait for the restart
    6. Skip through a minimal setup
    7. Activate developer mode
    8. Allow usb debugging
    9. Reboot into download mode
    10. Flash recovery.tar in the AP slot
    11. Reboot the A20 into TWRP and mount everything that you can.
    12. Format Data (not just wipe) - don't restart
    13. Flash Disable_Dm-Verity_ForceEncrypt
    14. Wipe both caches then go back and Reboot into Recovery.
    15. Restore your data backup.
    16. Reboot

    1
    I have FBE not present in TWRP recovery, is that a problem?
    8. Reboot the A20 into TWRP and mount everything that you can.
    9. Format Data (not just wipe)
    10. Flash Disable_Dm-Verity_ForceEncrypt_08.18.2019.zip
    11. Reboot into Recovery.
    1
    Please how to boot manually to download mode? I have installed Carlos Kernel and my phone has black screen after Samsung boot logo.

    turn phone off
    connect to computer and hold down both volume keys

    but for twrp mode
    hold all 3 buttons until the phone reboots and release volume down