The first action you can take is, you can tune in to the manufacturer or hard reset of your smartphone through recovery mode. This is highly recommended and can be used at certain times when confronting complicated problems.
If you prefer to flash, download the right file for your smartphone model. I will try to give you the option of providing official firmware. This File will help you to fix some software issues.
You can use 5 recommended files to install on a smartphone and that can also be used as a way to downgrade or update the OS version. From the few files I recommend, you can choose the firmware code according to your own country name.
Model: SM-A705F
Name: Galaxy A70
Country: Cambodia (CAM)
OS Version: Android 9 Pie
Build Date: 11-09-2019
Security Patch Level: 01-09-2019
Product code: CAM
SM-A705FXXU3ASI3
5 Files: BL, AP, CP, CSC, Home
Files Size: 4GB
DOWNLOAD
Model: SM-A705F
Name: Galaxy A70
Country: Thailand (MPT, Mectel) (MYM)
OS Version: Android 9 Pie
Build Date: 11-09-2019
Security Patch Level: 01-09-2019
Product code: MYM
SM-A705FXXU3ASI3
5 Files: BL, AP, CP, CSC, Home
Files Size: 4GB
DOWNLOAD
Model: SM-A705F
Name: Galaxy A70
Country: Thailand (THL)
OS Version: Android 9 Pie
Build Date: 11-09-2019
Security Patch Level: 01-09-2019
Product code: THL
SM-A705FXXU3ASI3
5 Files: BL, AP, CP, CSC, Home
Files Size: 4GB
DOWNLOAD
Model: SM-A705F
Name: Galaxy A70
Country: Indonesia (XID)
OS Version: Android 9 Pie
Build Date: 11-09-2019
Security Patch Level: 01-09-2019
Product code: XID
SM-A705FXXU3ASI3
5 Files: BL, AP, CP, CSC, Home
Files Size: 4GB
DOWNLOAD
Model: SM-A705F
Name: Galaxy A70
Country: Malaysia (XME)
OS Version: Android 9 Pie
Build Date: 11-09-2019
Security Patch Level: 01-09-2019
Product code: XME
SM-A705FXXU3ASI3
5 Files: BL, AP, CP, CSC, Home
Files Size: 4GB
DOWNLOAD
Model: SM-A705F
Name: Galaxy A70
Country: Vietnam (XXV)
OS Version: Android 9 Pie
Build Date: 11-09-2019
Security Patch Level: 01-09-2019
Product code: XXV
SM-A705FXXU3ASI3
5 Files: BL, AP, CP, CSC, Home
Files Size: 4GB
DOWNLOAD
Tool & Driver
Odin3-v3.13.3
Size: 2MB
DOWNLOAD
SAMSUNG USB Driver for Mobile Phones
Size: 35MB
DOWNLOAD
Flashing Guide:
1. Extract the firmware file that you just downloaded and you will get 5 files.
2. Make sure the SAMSUNG driver is installed on your PC.
3. Restart your phone in Odin mode.
4. Once in download mode, connect your phone to the PC, it's better to use the original USB cable that you got with your phone.
5. You will see that Odin will detect your device with a BLUE box and appear with a COM port number.
6. Add each file to each field in Odin according to the column names BL, AP, CP, CSC. Use CSC files if you want to do a clean flash or HOME CSC if you want to save your applications and data.
7. Don't check the additional boxes and the only options to be checked are F Reset Time and Auto-Reboot.
8. Click the Start button, wait for Odin to say 'PASS' in the GREEN box.
9. After the flash is finished, your phone will reboot, and you can disconnect your phone from the PC.

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