i also flashed the newest rom last night, but unlike you I lost 3g and HAVE 4g. tried restoring an old backup of a previous version that was working but still same problem.
My 3G is working. Sadly I live in a non-4g area so can't say whether or not 4g works, but I did turn on LTE/CDMA mode and it took it a while to pick up 3g again.