Hub v3 impossible to connect

SmartThings has released the instructions for resolving 33-504 error in the following thread:

I tried this method, but my router does not allow to block the UDP 123 (it’s a eero), so I need to update the firmware through the USB port. I sent an email to the support requesting the latest firmware.
Waiting for a response

Post in the thread I linked to. There is a support person helping users there :slight_smile:

Same issue - I have two 3v hubs that I can not add? Is there a firmware option available via the USB? I have attempted Ethernet / Wifi from my home and office to register.

I posted a link above to the thread ST created for Troubleshooting. It has instructions for resolving the 33-504 error and hub replace options if needed (first post in that thread). Post in that thread as staff are actively monitoring it.

Thank you - Made a post there

1 Like

I am having this same issue. Followed all the standard troubleshooting directions. Will you please send the instructions as well.

Read the first post in the following thread for resolving the issue. If you still encounter any problems, post in that thread as ST staff are monitoring it.

Hi everybody, Simple solution to block NTP(for routers that not permit block ports):
Find parental control on your router settings and block all NTP active servers on your country. Check https://www.ntppool.org, choose your country to see what are NTP servers for you. Block them all on parent control or create a firewall rule. If you do that you finally can add and update your hub…

Hello Itati, I am having the same issue, my hub is stuck on downloading, and nothing is happening, my serial number is 3022200905. your assistance appreciated.

Hello Itati, I am having the same issue, my hub is stuck on 33-504 error, and nothing is happening, my serial number is 5011000412. your assistance would be greatly appreciated. M/N: IM6001-V3P06

Figured it out, block UDP 123 port, update should go through, tried both android and ios.

I tried this. Blocked it on pfsense. Still don’t work

How did you tested your UDP was blocked?

Didn’t test to be honest. Was assuming one port 123 udp is blocked it would work


This is how I tested, I have tried many things, changing the subnet, different service provider, nothing helped, only blocking UDP 123 did the trick.

same issue 33-303
SN 5011100555
@Itati