Archos Xenon 70, what gen and any custom roms?

My 2 sons both have an Archos Xenon 70 Color. The problem is that the tablet only has 8GB internal storage. I bought them an SD card, but appearantly Android 5 doesn't allow you to move or install apps to the sdcard, nor format the SD card as internal storage.

Searching the internet, I only came across shady looking sites that all promise easy installation of Android 6 on them. Here on xda they only talk about gen8, 9 and 10, but what gen is this tablet exactly? Does anyone know of any ROMs that go on this?

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