The connection slot on my Forma is the same as on my Glo HD, and I can use the same (Kobo) cable to charge/connect both. So whatever connector type it is, it hasn't changed for the Forma. Looking at your photo, I'd say it is a Micro-B. I know with my phone some third-party cables don't provide good connection; that's probably the case with your older USB cable and the Forma.
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