I just upgraded several Mikrotik products (951G, 3011, CCR1016-12G and hAP ac) to ROS 6.44. As has happened several times in the past, one of the hAP acs bricked and went into the 'boot loop' many of us have seen. I went to Netinstall to bring this unit back to life, with MANY failed attempts. Finally, I inserted a gigabit switch between the PC and the hAP ac, and got Netinstall to work. In the past I've recovered 6 of this model with Netinstall, and had to RMA three others that were too far gone. No problems at all with any other Mikrotik models.
Has anyone else had this problem with the hAP ac units? Does this unit have some hardware design issues? Since I use these exclusively as APs, I don't think I'll buy any more of these in the future. I'll go with the newer cAP ac line.