You must upload the same format as the original book. How did you create it? Go back, fix the underlying document, and re-create the book just as you did before.
Alternately, un-publish the old version (but first record the ASIN), build a reflowable book (much better, in my opinion), and upload that. Then, when it's published, ask Support to link it to the old reviews, for which purpose they'll need the ASIN.
(Don't trust KDP to publish a print edition. Don't trust CreateSpace to publish an ebook.)