I'm on US unlocked S21 Ultra (SM-G998U1).. I've also used iPhone and was seeing 5UC.. so I flashed my s21 ultra with T-Mobile firmware (SM-G998U) and I was able to see the 5UC!!! I think it's something that's baked on T-Mobile firmware but I'm not sure. I backed up my files using smartswitch prior to flashing.. because flashing wiped everything out 😉
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After beta 4 update, Amazon shopping app browsing was very sluggish and scrolling was jittery. I had to clear cache and data... seems to be working fine now.
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I have the Note 20 Ultra SM-N986U1 which is XAA (US Unlocked). Since I was missing the T-Mobile Video calling, I dowloaded the T-Mobile Firmware (SM-N986U) with TMB CSC.. Once the T-Mobile firmare is flashed (Did backup prior to flashing since it wiped out the contents), the phone booted up with T-Mobile boot logo and got all the T-Mobile features back. Using non-Wifi, did the speedtest and notice the download speed is 142mb compared to 96mb using the original unlocked firmware. Restored from backup and I'm all set 😉
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