![abir_670 abir_670](/skins/images/1BC8AA01BCA84E0C5EA5C291FBAE0408/responsive_peak/images/image_rejected.gif)
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Galaxy S21- Mark as New
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Galaxy S21- Mark as New
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Galaxy S21@abir_670 If your phone has the AT&T splash screen at boot up, it has AT&T firmware on it. The only time your phone will find firmware updates is when it uses the AT&T update servers. If you have a different carrier's SIM card installed, your phone won't find any updates.
If you have an old AT&T SIM card, even if it has no active service, you can install it into your phone. The phone will then read the AT&T update server location and you can use Wifi to check for updates.
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Galaxy S21You cannot change carriers on a device without first having the device unlocked by the previous carrier. You will have to have AT&T unlock it, then the new sim should work. And, yes, if you are not with your old carrier with a locked phone, you will not get the update. Once the phone is unlocked, you should get the update from your new carrier.
As far as the dented SIM tray, is the tray bent, or is there a dent in the area where the tray would slide out?
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Galaxy S21If you've found my post to be helpful, Please like my Comments āāā.
If my response resolved your issue, please press the Like and āāā to Accept as Solution button.
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Galaxy S21It would not update with that Sim card in
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Galaxy S21![](/skins/images/8F09214B559CA7D8F02E73578EDD67B3/responsive_peak/images/icon_anonymous_message.png)
![](/skins/images/8F09214B559CA7D8F02E73578EDD67B3/responsive_peak/images/icon_anonymous_message.png)