Delux firmware is no longer being sold or supported as far as I know, but is based on Asian firmware sure. That firmware was made by an expert and accordingly I believe it's safe if you can track it down.
Attempting your own conversion without serious fw manipulation is fraught with danger. Simple hybrid conversions with original boot.bin and Asian fw1_resorces.bin and fw_all.bin may disappoint but are usually easily reversable. My own experience with hybrid 13xx and 1690 was not good. Some more reading: [Only registered and activated users can see links. ] and [Only registered and activated users can see links. ].
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