In Qualcomm-based devices like the Redmi Y2, the devcfg partition contains data. Technical experts use specialized "Engineering" (ENG) versions of this file to:
With root:
| Error Message | Probable Cause | Solution | |---------------|----------------|----------| | FAILED (remote: Anti-rollback check failed) | Devcfg ARB index higher than bootloader | Flash a devcfg with same or higher ARB. Never lower. | | Sahara Fail: Failed to receive hello packet | EDL blocked by stock devcfg | Use an engineering devcfg from a custom ROM maintainer. | | fastboot: critical partition | bootloader critical flag set | Run fastboot flashing unlock_critical then reflash. | | Device hard brick after flash (no sign of life) | Wrong devcfg for your chipset variant (Y2 vs Y2 India) | Need to restore via deep flash cable + auth bypass file. | redmi y2 devcfg file
Unlike older Snapdragon devices, the Redmi Y2 ships with enabled in MIUI 10 and above. The stock devcfg file enforces ARB (Anti-Rollback). If you try to flash an older stock ROM or an unofficial file, the devcfg mismatch triggers a hard brick—the device becomes completely unresponsive, with no LED, no vibration, and no display. In Qualcomm-based devices like the Redmi Y2, the