Flash display without SD or without using the Nextion Editor

Hello folks,
I know this is a weird corner case, but is there a way to flash a new GUI to the display without using an SD card or the Nextion editor?

Maybe a standalone flash tool?
Thanks!

You can also use the Nextion Upload Protocol over the Serial Port.

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If you are driving the Nextion from an ESP32 running your own Arduino code, then there is a Nextion OTA library available.