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Download prebuilt image from release https://github.com/RomanLut/hx-esp32-cam-fpv/releases
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Write image to SD Card using Raspberry Pi Imager https://www.raspberrypi.com/software/
Choose "Custom OS"...
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Let it boot once into GS software or user prompt.
Sometimes it can boot into user prompt on very first boot because wlan0 and wlan1 get allocated in incorrect order. If it happends - just reboot, it should correctly boot into GS software.