# Sparrow Firmware Upload without elf file?

**URL:** <https://discuss.blues.com/t/sparrow-firmware-upload-without-elf-file/1278>\
**Category:** Troubleshooting\
**Created:** [February 20, 2023, 12:00am UTC](https://discuss.blues.com/t/sparrow-firmware-upload-without-elf-file/1278 "2023-02-20T00:00:58Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![JimM](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/jimm/32/16_2.png) [@JimM](https://discuss.blues.com/u/JimM)\
**Post date:** [February 20, 2023, 12:00am UTC](https://discuss.blues.com/t/sparrow-firmware-upload-without-elf-file/1278/1 "2023-02-20T00:00:58Z")

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The Sparrow instructions ([Sparrow Firmware Updates - Blues Wireless Developers](https://dev.blues.io/sparrow/sparrow-firmware-updates/)) are clear for Essentials boards firmware updating using .elf files. However, the more recent Sparrow Firmware files since v0.7.0 in GitHub ([Tags · blues/sparrow-reference-firmware · GitHub](https://github.com/blues/sparrow-reference-firmware/tags)) no longer contain .elf files? Please clarify how to upload the firmware without the .elf file. I am particularly interested in v0.8.1 with support for Seeed Wio-E5.

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**Author:** ![zfields](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/zfields/32/29_2.png) [@zfields](https://discuss.blues.com/u/zfields)\
**Post date:** [February 20, 2023, 3:54am UTC](https://discuss.blues.com/t/sparrow-firmware-upload-without-elf-file/1278/2 "2023-02-20T03:54:05Z")

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Hi @JimM,

Good catch, I will definitely create some new binaries for the latest release. However, our published binaries will only support the Sparrow hardware.

If you would like binaries compatible with the Seeed Wio-E5, then you will need to follow the instructions for building the firmware from sources published in the [Sparrow Builder’s Guide](https://dev.blues.io/sparrow/sparrow-builders-guide/).

Cheers,  
Zak

> _ **NOTE:** At the time of writing, we have not updated those instructions to describe the necessary changes to build for the Seeed Wio-E5, so I will reach out to you directly to help you through that process._