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by GuB-42
1419 days ago
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At least on my phone (Samsung), the "self-test" app is on the /system partition, which is where the user OS is, and you need to boot normally to use it. You can run it by entering *#0*# in the dialer, no need to flash anything. Having a dedicated test image (like /recovery) is a possibility, but it wouldn't be the same environment as the user. The kernel may be different, maybe some runtime calibration data would be missing, and most customers want to see their phone working after a repair. |
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