Purchased a sim unlocked SM-T978U (Verizon Tab S7+ 5G) and am trying to flash the unlocked or Tmobile stock firmware to it. I've gotten "passed" flashes everything when flashing all of the files from the corresponding stock firmwares, but everything it boots back into the Verizon firmware. Any suggestions as to what I'm doing wrong that would cause this? I've probably flashed this thing 20 times at this point. I feel like I need to change the CSC, but the process for changing I've found online references the dialer app which isn't available on the tablet. I do currently have a Tmobile SIM in the device which is sim unlocked and connecting to the network just fine.