@ManuN7 upgraded 2 ER605 to 2.1.4, no problems, but I had no problem with 2.2.0 either, both upgraded ones have a remote controller so it is not a local controller controller version 5.9 linux and...

@Karyuu thanks for the info, I have one in the lab now, everything seems to be working fine.

@lolo32 This is forum, and you get support from tp-link and other forum member here. but tecnical support do you find here. email support is problably the best for you...

@lolo32 then you probably have a defective device, then you need to contact tp-link support Mybee @Hank21 or @Clive_A from tp-link can help you.

@lolo32 this is a good description how to recover https://www.tp-link.com/en/support/faq/3062/

@TroyT if you have EAP225-Outdoor you can try this from Ubiquiti. Ubiquiti UMA-D