The error 0x5319 in LG UP indicates a secure boot / anti-rollback / authentication failure between the phone’s bootloader and the firmware being flashed. More specifically:
Unlike a simple USB connection error (e.g., 0x81000302), this error is security-related, not communication-related.
Follow this ordered checklist to identify the root cause (assume device is in Download Mode / LG logo or connected state):
Basic hardware checks:
Driver and software environment:
File and version validation:
System interference:
Device-side checks:
Advanced checks:
Since this is often a server-side error, the issue might not be on your end.
If none of these solutions work, the error may be specific to your device's current software state. You may need to visit an LG authorized service center or contact LG Support directly. lg up error 0x5319
Enter Download Mode on the phone:
Check KDZ ARB using LG Firmware Extractor or WindowsLGFirmwareExtract:
If KDZ’s ARB < phone’s ARB → cannot flash.
If the servers are up, your connection might be the culprit.
For Over-the-Air (OTA) Updates (Phone Only): The error 0x5319 in LG UP indicates a
For LG Bridge (PC Updates):
Sometimes, the error appears because you selected the wrong process type.
Steps:
While this isn’t a guaranteed fix, it works for minor mismatches.
Sometimes, error 0x5319 is caused by a missing or incorrect LGUP_Common.dll. Unlike a simple USB connection error (e
Fix:
This DLL overrides the model verification process.