G4AR firmware upgrade to 1.00.12 results in frequent lost internet connection and reboots

Are you using an internal or external antenna?  If you are using an internal antenna, the G4AR makes decisions on whether to use the internal antenna "omnidirectional" or "directional" mode which shows up in the "Advanced cellular metrics" T-Mobile Internet app display.  If the internal antenna mode selected by the firmware results in very poor reception, it could result in an internet disconnection.  This would be similar to my problem with my external antenna and flawed v1.00.09 firmware.  T-Mobile does NOT create the G4AR firmware.  Arcadyan, in Taiwan, makes and programs the G4AR for T-Mobile.  Apparently the Arcadyan programmers don't adequately check out their firmware before releasing it, leaving it to us T-Mobile customers to suffer the consequences and find the bugs before the bugs are worked out.  So far v1.00.12 is working okay with my external antenna which only has ONE mode, "external".  T-Mobile customers have no way to "roll-back" the firmware to a previous version that worked for them.  This is NOT right!!!  I happen to be a former computer programmer working for a rocket company years ago.  I made sure my programs worked, and I still have strong intuitive sense about faulty software or firmware problems.  Faulty firmware should never be released or left to the users to find the bugs!  Any bugs that users do find and report should IMMEDIATELTY be corrected, and T-Mobile needs to have customer support that listens and quickly reports those bugs directly to Arcadyan and demands an immediate fix!!!