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cstrouse/lg-ultrafine-4k-and-5k-monitor-firmware.md

Last active June 16, 2026 05:40
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Firmware downloads and zip encryption passwords for LG Ultrafine 4k and 5k displays
@mnevadaf

mnevadaf commented Jun 16, 2026

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27MD5KL-B and Tahoe 26.5.1. I tried the update using the patched app above, and it was able to get past the 20% hang I was experiencing with the stock LG Screen Manager app, so thank you!

But, when I try to update using the patched app, it reaches about 85% then stops the upgrade and shows the following:
Screenshot 2026-06-16 at 12 33 58 AM

I've tried unplugging the monitor from power and USB, waiting 5min, upgrading again - same issue. Anything else I can do?

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