adb reboot bootloader or hold Volume Down + Power.
The systemarm32aonlyimgxz full file is not something you download from the Google Play Store or an OEM’s official support page. It appears in specific, high-level development environments: systemarm32aonlyimgxz full
“Efficient Storage of ARM32-Only System Images Using XZ Compression: A Case Study in Embedded OS Deployment” adb reboot bootloader or hold Volume Down + Power
