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No service (AT&T) after update

Star I
  1. Model Name: ASUS ROG Phone 5S
  2. Firmware Version: WW-31.0810.1226.146
  3. Rooted or not: No
  4. Frequency of Occurrence: All the time
  5. APP Name & APP Version (If your issue relates to the app): Phone

    After installing this latest firmware update, I'm entirely unable to use this device as a phone. It shows zero service and will not use data even with the SIM card installed. I've attempted reverting back to Android 11 but the update fails every time. Is there any way to downgrade back down to Android 11 and then back up to the previous firmware that was confirmed working? (WW-31.0810.1226.76)

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