IMHO the operation you're trying is not - strictly speaking - an Upgrade: it is a Migration (from Comware 5 to Comware 7). There are restrictions and guidelines to do so.
I'll use bin files not ipe or, at least, check - by verifying your download checksum - if the whole downloaded file of Software Release 10500_7.10.R7180 is not corrupted. Never say never.
Maybe you need start by looking for a Migration Guide from Comware 5 to 7 for your HPE FlexNetwork platform (I recall I saw something related to HP FlexNetwork 12500 about Migration from Comware 5 to 7 out there, it will be useful).