Can you flash US firmware on Korean or Chinese s20?

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mx597turbo

Senior Member
Jun 24, 2009
184
1
70
Samsung Galaxy S20
OnePlus 9
I ordered a Korean S20 ultra (988N), but live in the US. Has anyone flashed the US firmware on a bootloader unlocked SD variant of the phone (ie 988U1 firmware on a 988N or 9880)? If so, did you have to change the CSC to XAA before or after you flashed the firmware?
 

mwyarm

Member
Dec 25, 2011
34
2
Samsung Galaxy S20
I ordered a Korean S20 ultra (988N), but live in the US. Has anyone flashed the US firmware on a bootloader unlocked SD variant of the phone (ie 988U1 firmware on a 988N or 9880)? If so, did you have to change the CSC to XAA before or after you flashed the firmware?
I don't have an answer to your question but will the non-US phone work in the US like on Verizon system as is?
 

mx597turbo

Senior Member
Jun 24, 2009
184
1
70
Samsung Galaxy S20
OnePlus 9
It should work fine on LTE. The main Verizon bands are 2, 4, 5, 13, all of which are supported in all s20 variants. I don't think you'll get 5g on any US carriers, so if that's important, better to pick up a US spec phone, and pay to unlock the bootloader.
 

mx597turbo

Senior Member
Jun 24, 2009
184
1
70
Samsung Galaxy S20
OnePlus 9
I don't have an answer to your question but will the non-US phone work in the US like on Verizon system as is?
I tested the phone (G988N) on both Verizon on TMobile. I was able to get 5G on both carriers. So I can confirm that all features (except possibly WiFi calling on Tmobile), work.

So using the KOO firmware in the US works perfectly fine. No reason to try to flash XAA.
 

Angeluz007

Senior Member
May 16, 2016
54
15
I tested the phone (G988N) on both Verizon on TMobile. I was able to get 5G on both carriers. So I can confirm that all features (except possibly WiFi calling on Tmobile), work.

So using the KOO firmware in the US works perfectly fine. No reason to try to flash XAA.
I wish you had tried lol I'm tempted to flash the U1 firmware on my Korean S22 Ultra but I'm looking for more info before going for it. Still no luck.