NSU 3.0.8 internalerror while updating

[Jignesh Jain1]

I have lumia white 720
trying to restore version already in phone
phone have some problem in software tries resetting n soft reset no luck

while trying to start update on nsu firmware files are downloaded but give internalerror notification and does not update

 

[Muessig]

Have you tried deleting and redownloading the firmware?

 

[Jignesh Jain1]

yes it check wheter frmware is proper ,
then it says preparing phone for update
after that Internalerror pop up appears