What keyboard you have seems to matter a great deal. Bought a Rapoo E6300 kbd, specifically designed for iPad. Paired fine in both Android and Windows, but never stayed connected for more than a few seconds after pairing – Then impossible to get to connect. Returned it, got another kbd (Linocell – probably a “store brand” – No idea who actually manufactures it) that at least on the box said it should work with Windows, Android and iPad – And it actually did. Paired it up, and it connects and works no problem at all. Has keys for switching the functionality for the different platforms, like what the Home key does, et cetera.
Rapoo customer support mumbeled something about “incompatible Bluetooth chip sets”, but as I could return it, I didn’t investigate further.
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