Hi,

I'm sorry I can't find the right Model - officially it was the TL-PA6030KIT with 3 3-port adapters.

I've got 3 AV600 (TL-PA6030) adapters - though they are 'old'  I use them a lot and I  noticed there was an update of the Firmware (MAC-7450-v5.3.1-00-X-FINAL.nvm and QCA7450_v5.3.1.00_CEClassB_3s_PA6030_131217_002.pib) so I thought it would be a good idea to update the firmware.

https://static.tp-link.com/resources/software/TL-PA6030KIT_V1_140227.zip

I first tried it with the newest tpPLC Utility. Though all the adapters were found and recognized I couldn't change a lot (QoS changing) 

Upgrading failed time after time - I was directly connected with a network cable to an adapter, WiFi was disabled, there were no other devices connected to the adapter.

I  resetted the adapter to factory settings - same result, updating failed

I even downloaded the 'old'  msi utility, which also recognized all the adapters, I could change QoS though, resetting also possible, but updating the firmware failed.

What is wrong?

Systeembeheer Calderholding