# Epmp 3K 4.8.1 to 5.11
**URL:** https://community.cambiumnetworks.com/t/epmp-3k-4-8-1-to-5-11/108272
**Category:** ePMP
**Created:** [April 1, 2026, 9:23pm UTC](https://community.cambiumnetworks.com/t/epmp-3k-4-8-1-to-5-11/108272 "2026-04-01T21:23:13Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@DigitalMan2020](https://community.cambiumnetworks.com/u/DigitalMan2020)
#### Post date: [April 1, 2026, 9:23pm UTC](https://community.cambiumnetworks.com/t/epmp-3k-4-8-1-to-5-11/108272/1 "2026-04-01T21:23:14Z")
Hi all, just wondering if any issues going from 4.8.1 to 5.11 on an e3k AP with a mix of 300-25 and 300-19 SMs?
---
### Author:  [@ninedd](https://community.cambiumnetworks.com/u/ninedd)
#### Post date: [April 2, 2026, 3:46am UTC](https://community.cambiumnetworks.com/t/epmp-3k-4-8-1-to-5-11/108272/2 "2026-04-02T03:46:18Z")
Silly question probably, but you’re using custom (non-default) WPA2, right? That can be a ‘gotcha’ when going past 5.10
---
### Author:  [@DigitalMan2020](https://community.cambiumnetworks.com/u/DigitalMan2020)
#### Post date: [April 2, 2026, 3:58am UTC](https://community.cambiumnetworks.com/t/epmp-3k-4-8-1-to-5-11/108272/3 "2026-04-02T03:58:30Z")
No silly questions in my opinion, yes using a non-default WPA2
---
### Author:  [@ChrisP](https://community.cambiumnetworks.com/u/ChrisP)
#### Post date: [April 3, 2026, 9:02am UTC](https://community.cambiumnetworks.com/t/epmp-3k-4-8-1-to-5-11/108272/4 "2026-04-03T09:02:29Z")
Hello there, can you please expand on this? We are non-default WPA2. Cheers!
---
### Author:  [@Vladyslav\_Sapeha](https://community.cambiumnetworks.com/u/Vladyslav_Sapeha)
#### Post date: [April 6, 2026, 11:05am UTC](https://community.cambiumnetworks.com/t/epmp-3k-4-8-1-to-5-11/108272/5 "2026-04-06T11:05:46Z")
Hi @ChrisP ,
I believe @ninedd meant that this could be an issue if you are using the default WPA2 settings, due to changes introduced in the 5.10.2 firmware.
> [@ePMP Software Release 5.10.2 is now available](https://community.cambiumnetworks.com/t/epmp-software-release-5-10-2-is-now-available/106498/1):
>
> **IMPORTANT NOTICE**
> The updated cybersecurity requirements of the European Union Radio Equipment Directive (RED 2014/53/EU) will become mandatory on August 1, 2025. To comply with these changes, firmware version 5.10.2 and later no longer include the default WPA2 key in the configuration. If the default key was previously in use, SMs may fail to reconnect to the AP after the upgrade. We recommend referring to the Cambium Community for the recommended migration steps.
>
> [Firmware upgrade path to ePMP version 5.10.2](https://community.cambiumnetworks.com/t/firmware-upgrade-path-to-epmp-version-5-10-2/106444)
---
### Author:  [@squirrely](https://community.cambiumnetworks.com/u/squirrely)
#### Post date: [April 7, 2026, 2:17pm UTC](https://community.cambiumnetworks.com/t/epmp-3k-4-8-1-to-5-11/108272/6 "2026-04-07T14:17:57Z")
We’re long on 5.x because of promised GPS fixes. They indeed fix it a little, it’s no longer that bad. But there still are some stability issues with traffic halts, sm disconnections and AP crashes. No performance improvement for e3k, but also no degradation observed going to 5.x. Generally I think you should upgrade to 5.11, since 4.x will see no further development.
---
### Author:  [@DigitalMan2020](https://community.cambiumnetworks.com/u/DigitalMan2020)
#### Post date: [April 7, 2026, 7:59pm UTC](https://community.cambiumnetworks.com/t/epmp-3k-4-8-1-to-5-11/108272/7 "2026-04-07T19:59:11Z")
Really appreciate your response, cheers!