If the screen turns white or freezes during a reset attempt, the NAND flash memory may be corrupted.
A straightened paperclip or small screwdriver. zkteco f19 factory reset
If you followed the hardware method and nothing happened, try these fixes: If the screen turns white or freezes during
Default Admin password = 12345 (sometimes 0 ). Re-enroll your users. zkteco f19 factory reset
If you are locked out because of a forgotten admin password, use the physical tamper switch on the back of the unit. This method bypasses the lock screen.