It won't brick if you use the hybrid firmware properly but don't do anything until I can get some more complete information from you or you might well end up with a doorstop! Now the v3.21 reference is making sense to me, you've used Pouch-X's firmware. You should have mentioned that you'd already converted your device to nuvi 465T, that information is absolutely crucial as are now your answers to the following:
  • Have you done a FULL conversion to HWID 0943? Please advise. (To be certain, check the HWID with G7ToWin or otherwise as detailed here: [Only registered and activated users can see links. ]).
  • Did you change the 2x5W logo to a 465T logo by re-flashing region 16 or not?