Manually upgrading firmware after failed OTA

[Earendil_Strife]

Hi guys, I am trying to upgrade the firmware on a recently adquired A20. OTA upgrade keeps failing on a specific patch, the one that goes right before the big Android 10 firmware update. Now, I downloaded manually the stock ROM, but Iam really hesitant about flashing it manually. My concern is about why did the OTA failed if it should have downloaded the "correct" firmware, what if this "correct" stock ROM I downloaded is also incompatible and I brick the phone. Im listing below as much info as I can

Model: Samsung Galaxy A20 (SM-A205G)
Android version: 9
One UI: 1.1
Baseband: A205GNDXU4ASK2

Samsung Smart Switch info:
Current Software versionDA:SK2/ CSC: SK2/ PHONE: SK2 (TPA)
Latest software version: PDA:UC1/ CSC: UC2/ PHONE: UC1(TPA) Size 3054 Mb (cant use directly this method because Im working via a proxy)

Failed OTA firmware: A205GUBS5ATA1 (this is the one that failed, acording to Samsung update list is the patch that "goes" right before the Android 10 update.

Now, I downloaded from https://sfirmware.com/es/ a stock ROM listed for this model and matching the PDA and CSC recommended by Smart Switch containing the following:

AP_A205GUBS9BUC1_CL19166873_QB38543428_REV00_user_low_ship_meta_OS10.tar
BL_A205GUBS9BUC1_CL19166873_QB38543428_REV00_user_low_ship.tar
CP_A205GNDXS9BUC1_CP18311048_CL19166873_QB38543428_REV00_user_low_ship.tar
CSC_OMC_OWO_A205GOWO9BUC2_CL19317238_QB38571244_REV00_user_low_ship.tar
HOME_CSC_OMC_OWO_A205GOWO9BUC2_CL19317238_QB38571244_REV00_user_low_ship.tar

The question of couse is: is this the correct ROM for my device?

 

[Earendil_Strife]

Update. Looking up I fount the probable cause, and its something about the "security version" In my baseband is U4 and both the OTA update and the one I found online are S9. The website said they should coincide, that may be the reason the OTA didnt stick. Should I flash manually anyways??

 

[ocnbrze]

Update. Looking up I fount the probable cause, and its something about the "security version" In my baseband is U4 and both the OTA update and the one I found online are S9. The website said they should coincide, that may be the reason the OTA didnt stick. Should I flash manually anyways??

you can always use smart switch to update your phone:
https://www.howtogeek.com/347831/how-to-use-samsung-smart-switch-to-update-your-galaxy-phone/

 

[ocnbrze]

or you can go to sammobile and flash the firmware yourself:
https://www.sammobile.com/firmwares/search/a20/

just make sure that you flash the correct firmware specifically for your phone. so make sure you look it up using the correct model number and country code.

 

[Techemma]

Make sure the ROM your getting has no real bugs. Being a non- OTA update you need to be careful for the issue on firmware that you're getting. Also must check the rom design for your mobile model and region.