Sure you can take it to tmobile wont do anything for you , Samsung will ask to go ubreakifix to flash or send it in to them . Just offer another suggestion instead if going around in hoops with Samsung and carrier . Also make sure not using VPN.I don't understand why the phone itself, and smart switch say that there is no upgrade, and yet samfirm says there is. I've never worked with Odin, and i don't feel comfortable working with it now. If the ota upgrade is supposed to come from Tmo, then i'll go there and let them try it. If they brick it, then i get a new phone. Sorry.
You wont brick your phone , your only flashing stock Samsung firmware , not rooting . Be same thing if send to Samsung what they would do or best buy, even ureakitifix. But cool and understand it's not for everyone .I have another option, and I'm going with it. I'll keep android 9 until I get the ota for android 10. I don't want to chance bricking the phone. After all, it's a Samsung, not a Pixel.
That's great wasn't so badOK, did it myself, with MediaFire and Odin. It's all good.
User data slot stays empty in Odin , not sure why it's there...but you use home CSC firmware file in CSC slot to save data no factory resetDon't know why Odin says not to us the "userdata" file?