Failed -remote 39-flashing Lock Flag Is Locked. Please Unlock It First 39-- Jun 2026

fastboot flash recovery twrp.img

To resolve this, you must explicitly unlock the bootloader, which typically involves the following steps: fastboot flash recovery twrp

Open and firmly close every door/cover on the device (front, side, rear, top scanner unit if copier). Listen for clicks. you must explicitly unlock the bootloader

This essentially bricked my update process. No matter what I tried—restarting, reconnecting, or using different tools—the system refused to proceed because of a persistent “flashing lock flag.” The error message itself is cryptic for most users, and the solution isn’t obvious. You have to dig into low-level commands or proprietary unlock tools just to clear a flag that shouldn’t be locked in the first place. fastboot flash recovery twrp