Hello support Mikrotik...
I tried to email to support@mikrotik.com yesterday... until now i just only get auto reply, and no answer until now... That why I write to this forum.

I only get 03:54:50 left on my Mikrotik RB433AH...

I'd upgrade my RB433AH ROS from 3.xx to 5.23. After upgrade, I update license, but failed invalid request received!.
I tried to downgrade to 4.17, and tried to update license, but still no luck.

Unfortunately, I forgot to backup the key first before upgrade...

Please help me immediately... before time runs out...

Thanks very much.

now my mikrotik stop working...
and no one answer my email...

It is bad. Support answers very late

Finally the new key arrived at my email at 21 Feb... after 3 days expired...

Anyway, thanks for the support