# Best firmware for ePMP 4600C on a 38 km PtP link (Ping & Throughput)?

**URL:** <https://community.cambiumnetworks.com/t/best-firmware-for-epmp-4600c-on-a-38-km-ptp-link-ping-throughput/109116>\
**Category:** ePMP\
**Created:** [October 21, 2026, 12:29am UTC](https://community.cambiumnetworks.com/t/best-firmware-for-epmp-4600c-on-a-38-km-ptp-link-ping-throughput/109116 "2026-10-21T00:29:23Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![marckos\_eed](https://d10gw3vjmzyp8.cloudfront.net/letter_avatar_proxy/v4/letter/m/9e8a1a/32.png) [@marckos\_eed](https://community.cambiumnetworks.com/u/marckos_eed)\
**Post date:** [October 21, 2026, 12:29am UTC](https://community.cambiumnetworks.com/t/best-firmware-for-epmp-4600c-on-a-38-km-ptp-link-ping-throughput/109116/1 "2026-10-21T00:29:23Z")

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Hello everyone,

​I have a 38 km PtP link using Cambium ePMP 4600C radios with 34 dBi dishes.

​Based on your experience with long-range links, which firmware version is currently the best for both stable/low Ping and high Throughput?

​Thank you in advance!

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**Author:** ![Andrii](https://d10gw3vjmzyp8.cloudfront.net/user_avatar/community.cambiumnetworks.com/andrii/32/33514_2.png) [@Andrii](https://community.cambiumnetworks.com/u/Andrii)\
**Post date:** [October 21, 2026, 11:06am UTC](https://community.cambiumnetworks.com/t/best-firmware-for-epmp-4600c-on-a-38-km-ptp-link-ping-throughput/109116/2 "2026-10-21T11:06:56Z")

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Hi @marckos_eed!

The latest stable 5.12.1 with all stability and performance improvements at the moment.  
Thank you!

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**Author:** ![ninedd](https://d10gw3vjmzyp8.cloudfront.net/letter_avatar_proxy/v4/letter/n/57b2e6/32.png) [@ninedd](https://community.cambiumnetworks.com/u/ninedd)\
**Post date:** [October 22, 2026, 10:00am UTC](https://community.cambiumnetworks.com/t/best-firmware-for-epmp-4600c-on-a-38-km-ptp-link-ping-throughput/109116/3 "2026-10-22T10:00:24Z")

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5.12.1 had been the best performing for us.