: If your J410F shows a "null" IMEI, it may be a baseband issue. UMT can often revive these "dead" modem signals by flashing the appropriate modem files or repairing the security partition.
If the standard method fails (especially on Android 9 or 10 updates), you need Combination Firmware: j410f imei repair umt
If *#0808# fails, try *#197328640# or use a specialized "Enable Diag" APK. NV Data Corrupted: : If your J410F shows a "null" IMEI,