I also have several hAP ac routers and had no issue upgrading them. I only had a problem with an older routerboard (first time I tried upgrading my first ever M

I also have several hAP ac routers and had no issue upgrading them. I only had a problem with an older routerboard (first time I tried upgrading my first ever Mikrotik), but that was because I did not know how the upgrade works and I cut off the power during the reboot (I was under the impression I have to reboot it manually). I never use the web interface though - winbox is way better.