# Modem HL8548 new firmware (5.5.26.0) connection problems

**URL:** <https://forum.sierrawireless.com/t/modem-hl8548-new-firmware-5-5-26-0-connection-problems/24727>\
**Category:** Legacy HL Series\
**Created:** [August 30, 2021, 10:43am UTC](https://forum.sierrawireless.com/t/modem-hl8548-new-firmware-5-5-26-0-connection-problems/24727 "2021-08-30T10:43:16Z")\
**Posts on this page:** 1\
**Showing post:** 21

<div class="post-metadata">

**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex025/user_avatar/forum.sierrawireless.com/jyijyi/32/4766_2.png) [@jyijyi](https://forum.sierrawireless.com/u/jyijyi)\
**Post date:** [September 1, 2021, 6:05am UTC](https://forum.sierrawireless.com/t/modem-hl8548-new-firmware-5-5-26-0-connection-problems/24727/21 "2021-09-01T06:05:25Z")

</div>

I don’t see problem

> [@HL8548-G downgrade firmware](https://forum.sierrawireless.com/t/hl8548-g-downgrade-firmware/18408):
>
> Hi, I’m trying to downgrade the firmware of one HL8548-G module from the version 5.5.24 to the version 5.5.22. I’m using the exe file provided by Sierra but when I run it, I have an error: “Library Error: IMCDownload.cpp:508 - SPH\_state\_await\_tra (1)”. How can I downgrade the firmware? Best regards, Fabrice

---

_[View the full topic](https://forum.sierrawireless.com/t/modem-hl8548-new-firmware-5-5-26-0-connection-problems/24727)._