Tommy

TRC

we have had 2 FLEX100 unit go completely down when power is removed. is there anything that can be done to avoid this on Our other units.

smb_corp_user

Maybe I am reading too much into this, but for your question to be answered, you may have to provide more information or be more specific in describing the scenario.

If your intention is to keep your units powered when power is removed, I can only suggest using some form of UPS to power those units by battery cells when power is down.

Failing that, if your post means to describe a situation where all the Configuration of said unit is lost when power is removed, then please confirm if this is the case. In that case, I refer to ZyXel Support or the power users in this forum to post their answers to you, given that they have enough information to know your actual issue.

Thank you for your continued interest.

Zyxel_Cooldia

Hi @TRC,
Welcome to Zyxel community.  
Could you please share more information about your issue

TRC

We have had 2 units that was working but when power was removed would not reboot. First one the SYS led just flashed and the 2nd only the PWR led would come on never changes off yellow never grn. 

Zyxel_Cooldia

Hi @TRC,
Please attach serial console to device, and check if anything output during boot up process.