Can you flash US firmware on Korean or Chinese s20?

[mx597turbo]

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]

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]

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]

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]

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.