Cisco 857 Restore Missing Lines

Question

I have backup up my Cisco 857 using HyperTerminal and the Cisco Serial Cable. The settings are:

9600 baud, 8 data bits, 1 stop bit, No parity, no flow control.

I have then tried to restore onto another Cisco 857 again using the HyperTerminal "Paste To Host" command.

Occasionally the pasting of commands seems to overrun the capability of the 857 to handle them and lines are being missed. I have tried adding flow control but this doesnt seem to have had any effect.