^what gm said, except that MfgTool (or imx_usb_loader, if you're on Linux) is useless for the Paperwhite - these tools operate on the "USB downloader mode" (yes, that's yet another mode) which can't be entered on the Paperwhite.
Use the fastboot tool.
PS, and SCNR: Yes, this will hopefully teach you to be careful with what you do.
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