Downgrading from latest firmware (ASJA)

[chippee]

.I just want to share my experience with the firmwares (G970F).
First im not against with any updates for the phone but I accidentally press the update for the latest which is the ASJA (Philippines Carrier) and i realize it comes with a new bootloader which is S3 and the stock is U1.

Is there anything I can downgrade the bootloader so I can downgrade the complete firmware also? I want the stock firmware the first one (March 2019) because of my own preferences and I just want to stay with it. Any ways to solve this even on the near future? Glad to hear some ideas. Thanks

 

[samsparkin]

I have a similar question. After the recent Feb 2020 security patch update, the bootloader has been changed from 3 to 4. I so wish i had not updated. Is there anyway to go back to Android 9 which has BL 3 via Odin? Help would be appreciated, thanks.

 

[sboida1]

im not sure its possible, moving from u4 to u3. the only possible solution o go back to android 9, is to find android 9 firmware with u4 security bit