Error message while flashing Raspberry Pi bootloader on a SD card

[CTRL-panino]

Describe the bug

Hello,
I’m not sure whether I should post this bug here or on the Pi Imager GitHub page.
When trying to flash the Raspberry Pi 4 bootloader to an SD card using Pi Imager, the following error message appears: “Input file is not a valid disk image. File size 722361 bytes is not a multiple of 512 bytes.”
I’m using the latest stable release of Pi Imager on macOS 26.1.

Steps to reproduce the behaviour

1. Open Raspberry Pi Imager (on macOS)
2. Choose "SD card boot" for Raspberry Pi 4
3. When trying to flash it, see the error message

Device (s)

Raspberry Pi 4 Mod. B

Bootloader configuration.

No response

System

No response

Bootloader logs

No response

USB boot

No response

NVMe boot

No response

Network (TFTP boot)

No response

[timg236]

The wrong files (zips instead of .img) were uploaded. It should be fixed by tomorrow.

[CTRL-panino]

@timg236 ok, thank you!

[timg236]

This should be resolved now.

[CTRL-panino]

Yes, it works now!
Thank you for the quick fix

[timg236]

Thanks for confirming this. Closing as fixed.