hello,
if by auto-image, are asking for the IE4000 to download the IOS image from the server? if yes, then this is not a recommended practice. its best to use 'archive download-sw ... <fn.tar>' to install IOS images to the IE4000. this is because the IE4000 release has additional files associated with it besides the IOS binary. these files are ncessary fo rthe IE4000 to function properly. the most important file is the FPGA file. there's a tight 1-1 mapping between the FPGA file and the IOS binary for a given release. they must be installed together.
PNP is pesky. as soon as there's running configuration, it will shut itself off. should anyway.