fastboot flash boot /full/path/to/boot.img This is often the quickest workaround if you’re only flashing one or two partitions. If you compiled Android from source, the build system already knows where your images are. Navigate to your Android root directory and run:
fastboot: ANDROID_PRODUCT_OUT not set You typed what you thought was the correct command, but instead of flashing, Fastboot just stares back at you with that vague error. Don’t worry—this is a common hurdle, and fixing it is simple once you understand what’s happening. In simple terms, Fastboot is looking for an environment variable called ANDROID_PRODUCT_OUT that points to a folder on your computer . This folder should contain the compiled Android images you want to flash (e.g., boot.img , system.img , vendor.img ). fastboot android-product-out not set
If you’ve ever tried to flash a custom ROM, kernel, or system image onto an Android device using Fastboot, you might have run into this frustrating line in your terminal: fastboot flash boot /full/path/to/boot
$env:ANDROID_PRODUCT_OUT="C:\path\to\your\images\folder" Once set, run your fastboot command again. You don’t actually need the environment variable. Simply specify the full path to the image you want to flash. Don’t worry—this is a common hurdle, and fixing
export ANDROID_PRODUCT_OUT=~/android/out/target/product/raven