I've updated and reverted twice now. The hAP AC LITE will not stay online after updating to 4.26.7.0. It boots up, goes a few minutes and then hangs.
I updated the LHG5 without issue.
Update to post - It seems to alleviate the problem if I turn off the 5G WAN wifi connection from the hAP.
I updated the LHG5 without issue.
Update to post - It seems to alleviate the problem if I turn off the 5G WAN wifi connection from the hAP.

I believe one of the specific issues was related to the wifi driver leaking memory, I was having similar issues with mine on earlier firmwares as well.
I had heard (but not confirmed myself) that if you disable the wifi you can use it as a wired only device for now
Probably not the answer you wanted to hear, for a near replacements the hAP ac2 would be a good upgrade but one feature it does lack is the POE out port.