Lg Up Error - 0x5319

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.

Enter Download Mode on the phone:

Check KDZ ARB using LG Firmware Extractor or WindowsLGFirmwareExtract:

If KDZ’s ARB < phone’s ARB → cannot flash. lg up error 0x5319

No. The error prevents the flash from starting. It does not cause data loss or bricking. However, attempting to bypass it incorrectly can lead to a brick.

The official LG UP is strict. However, the developer community created a patched version of LG UP that disables CrossDL checks. This is the most popular fix for error 0x5319. The error 0x5319 in LG UP indicates a

What you need:

How to do it:

Warning: Bypassing CrossDL can hard-brick your device if you flash completely incompatible firmware (e.g., LG G7 firmware on an LG V40). Only cross-flash between closely related variants.

Understanding the cause helps in applying the correct fix. The most common triggers include: Unlike a simple USB connection error (e