# HL8548 Firmware Upgrade

**URL:** <https://forum.sierrawireless.com/t/hl8548-firmware-upgrade/8157>\
**Category:** Legacy HL Series\
**Created:** [September 1, 2015, 2:49pm UTC](https://forum.sierrawireless.com/t/hl8548-firmware-upgrade/8157 "2015-09-01T14:49:02Z")\
**Posts on this page:** 1\
**Showing post:** 1

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**Author:** ![cgm\_sys](https://avatars.discourse-cdn.com/v4/letter/c/97f17d/32.png) [@cgm\_sys](https://forum.sierrawireless.com/u/cgm_sys)\
**Post date:** [September 1, 2015, 2:49pm UTC](https://forum.sierrawireless.com/t/hl8548-firmware-upgrade/8157/1 "2015-09-01T14:49:02Z")

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Hello,

what is the correct way to upgrade the fimrware of the HL8548?

I’ve tried to use the upgrade tool, but I get the following:

> [@](#):
>
> Use Port: USB1
> 
> Intel Command Line FlashTool v.1.37 (Download Library v.4.140,0.0 )
> 
> psi.fls (PSI) (NAND)  
> slb.fls (SLB) (NAND)  
> AENEAS\_FW.fls (Code) (NAND)  
> SAM\_6260.fls (Code) (NAND)  
> SAM\_6260-MSY.fls (Code) (NAND)  
> SAM\_6260-CDS.fls (Code) (NAND)  
> Booting ‘C:\Users\hartmann\AppData\Local\Temp\7zSC728.tmp\temp\psi.fls’, memclass: PSI  
> → Please reboot your phone device ←

when I restart the module nothing happens. USB1 is present in device manger.  
Would it be possible to use der serial port? There is no spec for command line ☹

I would guess USB1 appears to late for bootloader handshake?

best regards

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