Ldn-l21 pin problem (Solved )
 

Checking fastboot device.....OK
Reading info.....OK
Device Model: LDN-L21
Device Serial: 26EBB18731152838
Device IMEI: 864925041146351
Device Firmware: LDN-L21 8.0.0.166(C185)
Device Lock: Image is origin | Verify mode is enforcing | Check root info is safe | Lock state is lock | Root State: UNROOT
Waiting for server.....OK
Reading data.....OK
Posting data to server.....OK
Waiting for server response.....Failed: The data is empty
Operation {Reset ScreenLock} ID: 0FF68816D3491656
Elapsed time 06:34 -- Version 3.5.0

Fixed try now please .

yes now done
Checking fastboot device.....OK
Reading info.....OK
Device Model: LDN-L21
Device Serial: 26EBB18731152838
Device IMEI: 864925041146351
Device Firmware: LDN-L21 8.0.0.166(C185)
Device Lock: Image is origin | Verify mode is enforcing | Check root info is risk | Lock state is lock | Root State: ROOT
Waiting for server.....OK
Reading data.....OK
Posting data to server.....OK
Waiting for server response.....OK
Unlocking device.....OK
Checking file.....OK
Processing file 1.....OK
Processing file 2.....OK
Processing file 3.....OK
Processing file 4.....OK
Switching to ADB mode.....OK
Waiting for device.....OK
Patching.....OK
Waiting for device.....OK
Waiting for Ready state.....OK
- This operation may take a long time depending on the complexity of screen lock, PLEASE WAIT
Decrypting.....OK
Operation {Reset ScreenLock} ID: 21CC564FF5CBA925
Elapsed time 142:25 -- Version 3.5.0