cannot backup efs one plus 7pro

Operation : Backup EFS
Checking for existing devices...Found
Port : Qualcomm HS-USB QDLoader 9008 (COM11)
Driver Info : Qualcomm Incorporated, qcusbser.sys, 2.1.2.0
Opening Port...OK
Init Handshake Sequence...OK
Hardware ID : E1500A00 [SD855] 85495100
OPK_DATA : 7A44FD44C35394DC10E1B910D525491DA862D0E420FE0BEF04 0FECF30032DA08
Initializing Protocol...OK
Using Auto Loader Selection [1]
Preparing Loader...Done
Sending Loader [SD855]...Done
Executing Loader...OK
Detecting Chip Type...OK
DebugData : BAAAABAAAAANAAAAAQAAAA==
Using Alternate Method...
DebugData : BAAAABAAAAANAAAAAQAAAA==
Error getting Payload Information!
Error Log : BAAAABAAAAANAAAAAQAAAA==
Please use correct loader and check USB port / cable.
Operation Finished.
QcFire Ver. 4.9.1


i think loader issues,please check umt team what error could be..i tried multiple cables an tried different ports,still no fix