# Redline HMI Full SD Reflash

**URL:** https://forum.onefinitycnc.com/c/firmware-redline-cnc/redline-hmi-full-sd-reflash/207.md

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## [How to reflash the operating system on the Redline CNC HMI Screen w/Realtime Controller (Full SD Card Image)](https://forum.onefinitycnc.com/t/how-to-reflash-the-operating-system-on-the-redline-cnc-hmi-screen-w-realtime-controller-full-sd-card-image/36068)

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**Author:** [@OnefinityCNC](https://forum.onefinitycnc.com/u/OnefinityCNC)\
**Replies:** 0\
**Last updated:** [October 31, 2025, 3:33pm UTC](https://forum.onefinitycnc.com/t/how-to-reflash-the-operating-system-on-the-redline-cnc-hmi-screen-w-realtime-controller-full-sd-card-image/36068 "2025-10-31T15:33:25Z")

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Flashing SD Image In some instances, it may be necessary to restore the operating system image for a RTCNC system running on a Raspberry Pi. To flash the SD image you will need the following: A micro SD card with a mi…